Funny, I had the same thing... silly me, I always thought it was due to some incompatibility with the hardware since I have the v820w V5 and never really paid any attention to it afterwards. Turns out I'd probably made some typo/mistake when originally upgrading as I just went through the upgrading steps and that seems to have fixed it.

EDIT: I had to install the tablet from scratch and it wasn't a typo after all as the problem reappeared. I believe before running the long zypper install command again finally fixed it. YMMV
(I am not going to do everything all over again just to be sure, sorry)

Also, it took ages to get the WLAN working first. The best(/only?) way seemed to be from the prompt where the WLAN icon is presented and there is the text Turn WLAN on. I could never connect properly from Settings or Events View even though the password was 100% correct.
(After fighting this for way too long I am not sure anymore if the prompt appeared when trying to launch the Jolla Store with WLAN off but it just might've)

EDIT2: Ok, so I had to do it all over again :P
Due to that I made a github repo.

(Yet again I had initial problems with the WLAN. Before the update I could connect best as I described earlier. Then after the update the only working way seemed to be from Settings.)