Yep, it seems that - at the moment - the most reliable version remains 7.14.3, but hopefully it will be soon fixed, so keep an eye on new releases, wait a few days and if there are no new reports like :
http://forum.mikrotik.com/t/hap-ax3-random-wireless-disconnects/176477/1
http://forum.mikrotik.com/t/not-responding-f-k-a-sa-query-timeout/168864/1
proceed to update/test the new version.
But staying on 7.14.3 (provided that you need not any of the additional features in later versions) is (IMHO) perfectly fine.