Early November saw a product upgrade to Avira v.10 that unleashed one [bleep] of a memory leak. If you are crashing and you have this version installed and up-to-date, uninstall it! Try downgrading to v.9
Ir is worth a try. I have seen five of them in the last few days.
Personally I would uninstall it and install another. That has definitely worked elsewhere.
It may NOT of course be the cause of your problem, but it is an amazing coincidence that you have Avira with similar symptoms.
If you have the free edition unless you have stopped the updates you will have received it.
Hmmm, didnt know that. Ok I'll try it.