Oddly fixed.

It has been going on for several days, getting more frequent. So I tried restoring the sytem to a few days before it started. Went through the whole process and at the end it said it was unable to restore to that date. Tried another date with the same result. Very odd that I couldn't restore...

However, the attempt seems to have fixed to disc drive randomly opening up! It has been a full day and no recurrence.

So now I want to know what the heck is this all about??