Hi essexboy. Thanks for your help.

I have no idea whether it’s both IE or firefox as it’s extremely hard to test. It happens on average once or twice a day, so unless I switch to IE for a week I really wouldn’t know. I can start using IE instead from today and see… but I have already tried reinstalling firefox and this has made no difference. Would you like me to use IE instead from today? It might be a while before I can find out, or I can continue with firefox and I can say within a few days if the problem is still there. Such an annoying bug!

Attached logs from after the fix. Thanks again!