[arparent]

Yes, I beleive this is due to over heating. Especially when tethered, your PPC puts out a lot of heat. I have had the same issue before. I run my phone connected to EVDO, bluetooth headphones, and streaming internet radio all day long, and I occasionally have this happen as well. I've noticed it acts up more since we've started getting warmer weather, and my workspace has been between 85 and 90 degrees.