Sent a message to HTC, waiting for reply. Haven't overvolted as kernal doesn't support it and don't want to change to tiamat as everything works fine.

But.......

I did place a couple of folded rizlas between battery and clip and it hasn't shutdown since. Maybe after all the farting about removing battery and sim has took its toll on the clip. Anyway I'm happy running blind ice m5 with nearly no problems now.

Sent from my Desire S using xda premium

I dont know if it's just me but i noticed that those stuff happen a LOT more on ICS roms.
(although did have this in older versions of Reaper,
Endymion, Virtuous and especially RunnyDroid, never happened on sense 3.0 roms)

also:
* OverVolting helps
* Overclocking helps
* Tiamat kernel makes it WORSE ( at least for CM9 & MIUI v4)

Try This

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I had the same problem and i used to put a little piece of paper behind the battery
and i worked for me..

I was really curious when it started reboots and freezes on reaper. Never suffered from that before. on endymion I could even undervolt by -100.
On reaper I have to overvolt by 25 to be stable. Really strange

Sent by my fingers to your head.