When you get in a state that crashes Armory, try to start it with the --offline switch. If it starts, then what you are experiencing is some sort of recurrent DB corruption. Do you use an anti virus or some sort of system snapshot recovery? What about HDD and RAM health?
I don't use an anti-virus or recovery tool. I'll try what you suggest and check out my hardware (I haven't had any other problems though and bitcoind runs fine)
Thank you for your suggestions.