Monthly crashes are no big deal (in fact, I think, my phone crashes only once in a few months). Slight nuisance at most - e.g. if the crash corrupts Android app cache and system boots awfully long minutes, re-compiling the apps. However, I have three different mobile devices (2 phones and a tablet), from different vendors (Nokia, Acer, Samsung) that had suffered a hardware failure after some (5-8) years of use. Three dead eMMCs.
So, I'm sort of wary. It's exceptional, infrequent but happens quite unexpectedly and is very frustrating when it does. Especially if the recovery keys (which are rarely accessed by design) are lost, inaccessible (you're on the road) or misplaced.