Wrong comment opens for quick edit

I’m running 2.9.2

Over the last few days I ahve noticed some strange behaviour within the admin section.

The some examples I remember clearly are:
when I tried to “Quick Edit” a comment it would open the previous comment. A proper edit would be fine, it was only quick edits.

Another one was yesterday when it wouldn’t allow me to edit a post. It simple reverted to the original post but told me it had updated.

Tghe last one is that would wouldn’t delete drafts.

I have made no changes to the configuration or added any plugins for months.

When I logged into phpMyAdmin today I saw this message:
Your PHP MySQL library version 5.0.32 differs from your MySQL server version 5.1.39. This may cause unpredictable behavior.

My host, Dreamhost, said it was nothing to worry about and wasn’t even sure the points are connected.

Can anybody shed some light on this and hopefully help stop the strange behaviour?

TIA