My Account is now regularly getting LOCKED for NO REASON. WHY???

My account is ALWAYS, daily getting LOCKED, and there is NO REASON for this. But I have to reset my password all the time only on a desktop browser which means I don't have access to my email most of the time. STOP Doing this!!!!

I can find NO REASON that you would do this, nor any way I can adjust security settings to stop you from messing up my life so greatly.