OK, I took the SDCard out of the phone and moved most photos on my laptop. Card back in phone and the gallery complains about missing photos haha ;-)
Let's see if that can help get more battery out of the phone and less crashes.

After flashing and booting for the first time, one cannot create the Jolla account for some reason. It complains about network connection error. Even after that, trying to create the account from the settings menu does not work for me. Neither does the Fruux account. I have to reboot the phone, wait for the 4G sign to appear and then only can I create the accounts and it works.