Tivo set top box on its way out?

[sexssive]

Hi all!
Have had my Tivo S3 HD box for over 2 years and has run flawlessly in all that time!
However there are some minor and not so minor things i am noticing happening in the last few days/weeks

Minor: My 'season pass' - while they are set to record 'first only', i have noticed that when i look at the To-Do list, the season pass is scheduling to record ALL instances of a program

Major: In the last week, my Tivo box has frozen and completely unresponsive. This happened once 4 days ago (static looking grey/multicoloured screen) and once 3 days ago (frozen on a program/tv channel). Unplugged power and powered back on and all was working again. Yesterday i noticed that sometime after the previous reboot, the box was completely off. No lights, nothing. I pulled it out of its home, tried different power points and cords, and still nothing. Removed the case and used compressed air to give the inside a bit of a clean, plugged it back in to test and got it powered on again. This all happened around 3pm. Sometime between 3pm and 5am this morning, the box had once again gone into a frozen state (frozen on a program/tv channel), unresponsive to any remote control operation.

I've done a little bit of research and haven't found too many people having these intermittent issues, i've looked around these forums and nothing much is seen about this issue. I've read some US forum posts, which has indicated that the internal Tivo HDD could be on the way out.

It just seems strange that after 2+ years all was fine, and then in the space of a week it's given me a number of headaches. I logged a support ticket with Tivo, though i'm just wondering whether it's going to be of any use, and whether i should just replace the HDD myself (using the Engadget instructions found within this forum)

Thoughts from some Tivo forum regulars?
Thanks,
Luke