Sudden network disconnects on both SIM slots

If you’re experiencing these issues late July / early August 2016, then the topics below are most likely the more relevant discussions. To avoid multiple parallel discussions I’m closing this topic, please continue in the topics linked below:

For general discussion of this issue (link to first Fairphone reply for convenience’s sake):

For discussion of possible workarounds see:
https://forum.fairphone.com/t/network-disconnects-gps-problems-and-re-entering-sim-possible-workarounds/20642?u=johannes

If there is a specific comment on the original post of this topic, message me or any of the other moderators to re-open the topic.