Unfortunately I don't have any contacts at Rigol. Just regular bug-reports via their website and it seems several guys here on the forum tried this already without getting more information?!
I guess I just give the v1.16-beta a shot on my PSU. It is one of our oldest units (about 5 years, now) and if v1.16-beta has some really bad issues and can't be downgraded back to v1.14 I guess it just broke down... ;-)
Due to the random nature of the resets I guess I won't really be able to tell, whether v1.16 fixes the resets or not, unless I still get resets even with the newer firmware. If I don't see resets, it might also be just a lucky run, like I also seem to have with v1.14 some times (sometimes not a single reset in several weeks of daily use).