I've got two A3s, the older one from the first shipment last year (now with v2.0.77 installed on it) and the newer one from March or April of this year running v2.0.72. I've had lockups, especially after doing several blindscans in a row, that required pulling the power plug to reset the receiver. Though they don't stay on 24/7, my receivers are used every day for satellite reception and sometimes as media players on my network. I do some recording with them but very seldom schedule timers for recording. I haven't loaded very many apps on them. In fact, the newer one only has three or four more than it came with.
I treat the A3s just like I do my computers, making backups both before and after making changes. All my network devices here, except for the phones and tablets, are connected by ethernet cable and have static IP addresses assigned. The only DHCP addresses assigned by the router are for the phones and tablets we have.
I've only had to perform factory restores on the A3s here twice, once on the older one when I screwed up an update, and once on the newer one after I upgraded XBMC to Kodi. It was totally unreliable with Kodi installed, locking up every time I tried a blindscan. The factory restore and reloading my original backup fixed everything and blindscan started working reliably again. That box is still running XBMC. Surprisingly, the older A3 (with .77 now) is running Kodi fine.
I don't know why I'm not having all the problems reported by so many others but I'm glad I don't.