Frequent post-patch crashes/reboots from game

[Russkly]

The patch has definitely been an improvement for me (and response duly posted in relevant thread), BUT:

Now getting more crashes/reboots than pre-patch (where it happened but was fairly infrequent).

Can even happen just while taxiing or when flying over water or countryside/towns.

This is obviously very worrying.

Windows records it as an Event 41 Kernel Power error.

I had overclocked my CPU, so I reset it back to defaults - same problem.

Turned off HyperDrive via the ASUS SmartDoctor software - same problem.

Increased CPU temp. threshold to 60c in BIOS - same problem.

Noticed whilst in BIOS that CPU temp was below 50c, but IOH was 75c, so I don't think it's a temp issue(??).

PSU is rated at 720W, so I'm hoping it's not that.

Lowered graphics settings gradually after each crash/reboot, but still happened with everything low except Model Detail, Damage Decal (both high), Land Detail (medium), roads and shadows on, and grass off.

Not seen this with other games, even RoF on maximum settings.

Any ideas, because it's definitely more frequent since the patch?

BTW I have searched the forum under "reboot" and "crash", but couldn't find any similar problem (at least not without searching some of the larger threads!).

R