Strange issue I have ~every 2 weeks on every ROM

[bamrock]

I've never notice anyone else post this but I thought I would give it a shot. I've tried the OEMs, the No2chems, DCD, I've tried a bunch of different ROMs and they all seem to have the same issue for me. They work fantastic for about 2 weeks and then all of a sudden my phone craps out on me. Now it's not that the phone stops working, it just gets EXTREMELY unresponsive. All of the peppy behavior of my phone after a fresh install goes right out the door. I find myself having to reset the phone like 10 times a day because it gets so bogged down or plain frozen. Does anyone else have these issues or just my crazy phone? I'm wondering if during the flash it's not deleting something perhaps? I flash from the SD card and just rename the .nbh file. I normally pull the battery for 10 minutes afterwards so I don't think that's the reason. I flash....pull the battery....then do a hard reset before using the ROM. And I don't really have a lot of programs installed (and all the ones I do are right after the flash...I don't add more into the 2 weeks). It just seems random that all of a sudden the "RAM" or whatever it is seems to become really unresponsive and just plain unusable. Sorry this is is so long...just kinda throwing it out there to the community to see if anyone else has similar issues. TIA
Bam