[COLOR="rgb(72, 61, 139)"]Well because this community has turned my phone into a stud from a dud nows my chance to chance to give back.
=D>
Grab a coffee or a beer....or mix both, sit back and enjoy the read.
I too had failure to wake/Sleep of Death problems in fact every time my phone went off either manually or automatically it wouldn't come back on no matter what I tried (removing the stylus, opening the keyboard, pressing the button repeatedly. (Thank goodness for psshutxp, oddly I also noticed that jiggling the plug around where the outlet is on the phone also made it come on) I've read almost all of your stories and I experienced every symptom that you are having. Let me tell you now that it doesn't have anything to do with the cabs that you have installed...why do I say that if you carefully read peoples stories you'll notice that people using completely different apps are having the same problems. So then your next thought is....it must be a rom issue?! Nope not that either I use to be a flash-a-holic I tried everything TRUST ME! lol It happened on every rom I tried. So my next thought was to flash back to stock (for me its telus) SURPRISINGLY the problem was still there
and I couldn't seem to understand how on earth this problem survived a hard reset. So then a little tear ran down my eye...(what?....I don't have a warranty lol) I'm just kidding about the tear.... sort of! But the anger was there
After uninstalling and reinstalling everything cab by cab, hard reseting, soft reseting, opening up my phone (and I mean stripped it butt naked), remapping keys, and even going as far as making it so that the phone never goes off lol (bad solution you'll barely get 5 hours without even touching it) I've come to the conclusion that the problem is
a system software problem which causes a hardware problem...so its both
I've waited a month to be sure that this works because every time I'd uninstall a cab and my phone worked fine for an hour or a day I thought I found a fix...but then reality kicked it the very next day. At one point I thought it was pocketshield, then smartlock, then coreplayer, then keyboard config, then nitrogen...the list goes on lol
Heres what worked for me....[/COLOR]
1. If you are using an aftermarket wall charger (burn it...ok ok...but stop using it and go back to the OEM usb cable that came with your phone...yes its a little flimsy...at least mine was but believe me after a few full charges it will make a world of a difference. Lets look at an example, your car manual recommends 5w30...you put in 15w20 your car will still work but eventually you will have problems 
so get a couple full charges in with your oem oil... I mean usb cable!
2. Flash back to stock and CLEAR STORAGE 2-3 TIMES < yes you read right the more the merrier! Then flash to the rom of your choice (I've been using cfay 1.3, the only rom I was able to get IGO8, and coreplayer to run the way it did on 6.1 without any scripts) and then again CLEAR STORAGE 2-3 TIMES!! The more the merrier!! And make sure to remove your battery and even sim card before doing so....(why u ask? 
...I was trying to narrow down the problem and its what I did so stop asking questions damnit lol) < sorry its the caffeine talking!
An alternative to overdosing on that, "clear memory" button that you can use is Task 29 as mentioned by mjh8812 to fully destroy and annihilate all traces of roaches (backlight/screen system files) and then flashing your rom of choice.... but hey I guess I'm just old fashioned and I told you what I used.
3. Once thats done install lumos v10 rc2 (yes it will work fine on the tp2) when your doing the calibration use natural sunlight preferably not on a bright day) so that in low light levels your phone will have no trouble sensing light. The proximity sensor on our phones is also on my list of suspects....I don't have proof though.....yet!!!
4. If you are using a locking program, such as s2u2 upgrade to the newest version...I use s2u2 2.34
After doing all these things I haven't had a failure to wake/SOD in one month no matter how hard I try to get one.
Does this guy know what he's talking about, lets see...
The only way that this problem can survive a hard reset back to stock is that it must be some system ****roach files that refuse to die...so by clearing storage multiple times your literally stepping on those ****roaches. (hmmm.... I believe Mighty himself told you to do so to avoid (weird) problems. It almost as if when flashing from 6.1 to 6.5 SOMETIMES those backlight/screen ****roach files survive the nuclear bomb of a hard reset and don't die so when the new roaches come in there's a turf war! lol It sounds funny but I honestly think its the truth. PROVE ME WRONG!! Therefore, it could be directly related to the software that allows us to flash in the first place. I'm not trying to step on any toes but... moving on.
why the usb plug change....
Although the use of different shaped usb cables will still allow you to charge/sync your phone in the manual it actually states (ONLY THE AC ADAPTER AND USB cable sync cable provided with your device must be used to charge the battery. Trust me I tried to break down the problem like a science and realized its hard to put blame on other things when your not following the manual. I found that the problem was much worst when I was using an aftermarket plug.
why the change to lumos...
(Ahh back to those gangsta ****roaches) Well, there are only 2 backlight replacement programs (also known as the cops/military lol) I've lost faith in the 6.5 roaches to do their job properly without the cops/military watching them at all times....I've been able to find Ageye G-Light which does work on the phone....However, lumos gives you much more settings and a more smoother transition between light changes. I don't use manila or sense (what memory hogs, and too many steps to do simple tasks), I personally thought spb was ugly so I use iphonetoday 1.3 <1.5.1 is the newest version but I don't like fixing what in my opinion isn't broke (so let the hatred begin lol) and my battery will last 10-12 hours with moderate-heavy use....light use it will last a few days.
Finally, your lock program....
I used s2u2 v2.30 for the longest time and I can't quite prove that it was a culprit but I still had it as a suspect and I believe it added to the problem because whenever your phone goes off and you press the power button to come back on it calls to the locking program to lock the screen. It also allows you to program how much time before the locking screen will pop up etc etc... bottom line your locking program works with your backlight/screen system software so if they are supplying guns to the ****roaches they're just as guilty so keep yours up to date
After I jumped through all these hoops I haven't had a single problem with my backlight in 1 month. Believe me when I tell you I hated this phone, especially when my friend and his damn iphone 3gs would rub it in 
.... But now that the problem is solved and I have the customization of windows mobile, the functionality of an iphone, and a hard keyboard he keeps his mouth firmly shut 
So after jumping through all these hoops I hope that you fall back in love with your tp2 because this past month like I have.
Peace