I'll tell you about my investigation SOD problems. I have the HTC HD2 with SD Android 2.3.7. Periodically, I have SOD. Sometimes this happens several times a day, sometimes a good week without a single SOD.
After extensive searching, I identified three main possible causes: proximity sensor, radio firmware, SD card.

Two weeks ago I had SOD began to happen very often, I have flashed radio from 2.11.50.20 to 2.15.50.14 and formatted SD card. Nearly two weeks after this was not a single SOD. Yesterday, however, SOD started again. No new software during this time are installing and system settings is not changed.

I guess is the SD card version. Ordered a new A-data 16Gb class6 (now Transcend 8Gb class6), a couple of weeks after the replacement card will write a report.

If your sd card is corrupted, you can definitely have device issues. Scan it, and see if there are errors on it. I've had corrupted usb-drives crash a PC before.

Originally Posted by Farmer Ted

If your sd card is corrupted, you can definitely have device issues. Scan it, and see if there are errors on it. I've had corrupted usb-drives crash a PC before.

I scan my old 8Gb sd card using windows scan disk (via cardreader), and SKTools in WM6.5 - no errors.

This card is used 1.5 years, half of them in the wm and ~ year in Android (SD Build). SD Android builds make heavy load to SD, many write cycles. I think, after one year use, some sectors may have more than 100k write cycles and begin to wear. (100k proof: can't post url, check "Flash memory" article in Wiki)

PS: One day in new 16Gb SD, no one SOD, but too early for say anything.

PPS: Sory for my english.

My final report: I resolve SOD problem for me completely. After replace old Transcend 8Gb class 6 card to A-data 16Gb class 6 more month ago and no one SOD from this time.

I checking old SD card for errors (by SKTools in phone and scandisk via cardreader) and no errors founded. Now i'm use old SD card with SD-USB adapter and have no problem. N oidea, what happenet with old card, but fact: i have SOD with old card and no one SOD with new.

Old and new card 6 class, but new card much faster, Android SD build on my HD2 faster booting, wake up, responsing. I think, may be SOD cause in speed or latency time.

My advice to all, who are encounters SOD problem: try another SD card, faster is preffered.

You should always remove all cards and removable stuff to debug anything.

SOD can be in your caused by bad SD but mostly it is not.

From my experience SOD is usually bad BGA balls under CPU or bad non removable memory. Each of those 2 things are not repairable for us regular users and question is can anyone repair it without new main board and for price lower than buying new device.

Originally Posted by Sendrey

My final report: I resolve SOD problem for me completely. After replace old Transcend 8Gb class 6 card to A-data 16Gb class 6 more month ago and no one SOD from this time.

I checking old SD card for errors (by SKTools in phone and scandisk via cardreader) and no errors founded. Now i'm use old SD card with SD-USB adapter and have no problem. N oidea, what happenet with old card, but fact: i have SOD with old card and no one SOD with new.

Old and new card 6 class, but new card much faster, Android SD build on my HD2 faster booting, wake up, responsing. I think, may be SOD cause in speed or latency time.

My advice to all, who are encounters SOD problem: try another SD card, faster is preffered.