This exact issues cause me not to receive anymore SMS text and 0 free memory.
http://community.sprint.com/baw/message/128509#128509
I am experiencing the same issue posted over at androidforums.com. Today I had to take my phone back due to 0 amount of memory left on the device and no SMS or voicemails being received on the device. This along with the sleep issue is unacceptable and I have no clue how Sprint and HTC released devices with such obvious flaws. I was fiving Sprint and HTC another chance after my 6 month disaster of the HTC Touch Pro. Over that time I exchanged it 5 time due to the keyboard failing.
Here is the EXACT same issue I am experiencing:
CLICK ME! or read below.
ROM Memory Leak Filling Up Internal Memory
Issue:
Over time, Internal Memory free space dwindles and no amount of clearing apps frees the space. This will also cause the above issue of SMS & Voicemail messages not being received once a critical amount of free space is reached.
During the past few weeks my my Hero has been exhibiting signs of a ROM memory leak. It led to not being able to receive SMS messages even after hard resetting the phone. See these threads for that issue:
HTC Working on critical SMS/Voicemail issue
Intermittent Text Message Receiving - Deals more with intermittent issue, but has some fatal sms isuues in it too.
MMS/SMS stopped working after out of space error?!?
It appears a leak is being caused when rebooting (or turning off bluetooth) the phone when the phone is in a "connecting" status with bluetooth device. Basically the phone stays in a "connecting" status when it fails to connect, even though the notification in the notification bar says it is connected and your bluetooth device says it is connected. In actuality it is not and all calls and audio will be routed to your phone not bluetooth device. If you restart or turn off bluetooth while your phone with a "connecting" status active I have found when you reboot it will eat away at your ROM memory(not RAM). You may not ever notice the bluetooth connection failure if you don't get a call while when it should be active. The "connecting" status does not clear unless you unless it manages to connect after a while which is rare (either does it within a few seconds or not at all) . I made a video of this behavior because not a lot of people have been experiencing or at least catching on to it with their usage patterns.
Edit: It appears that the leak actually occurs even if you turn bluetooth off while the phone is in connecting status so a reset is not necessary for the leak to occur. This basically renders bluetooth use unusable as there is no way I can think of to avoid a leak if it gets stuck with the "connecting" status.
Sorry for the video orientation.
YouTube - HTC Sprint Hero ROM memory leak, possible SMS failure Part 2