Thanks for the replies. The tablet originally came with 26-8 firmware. I didn't know better initially, so I didn't flash it to the newest, and later on I had a bunch of applications installed so I didn't want to lose it if I didn't have to.

Tablet's condition deteriorated on Monday and by the afternoon it would no longer boot properly. The farthest I got was the desktop background showing, but the sidebar and the notification/tray area were blank.

I reflashed it Monday evening with the newest available firmware (38-2). The extent of the modifications since then was creating a couple bookmarks in Opera, setting it up to connect to my gtalk account, and using a 2 GB OCZ SD card (works fine in the card reader in my laptop) in the external slot. I'm also using the 128 MB mini-SD card the tablet came with in the internal slot.

Everything worked pretty much fine. I wasn't using it as intensively as before (little apps to use). I did get it to crash once on Monday, while attempting to skip around in a youtube video. At the time I thought I skipped around too much to ask of the CPU...

I just crashed it again using nothing but Media Player this time around. Stationary on a desk. The touchscreen and sound broke as before while I was messing around with switching from library to now playing and vice versa. I think I did it repeatedly in a short time.

After re-enabling the touchscreen through lock-unlock, I tried playing some music, but the error message told me "Unable to perform the operation. Try again." Within a minute the tablet rebooted.

I wonder if the problems are just caused by poor stability of the built-in applications? Alternatively, can the SD card be messed up? Is a certain amount of instability, demonstrating itself through touchscreen problems, simply to be expected?