Like written, for me the problem is that the Network Manager is crashing, the journal shows:
NetworkManager[1319]: g_mutex_clear() called on uninitialised or locked mutex
systemd[1]: Created slice Slice /system/systemd-coredump.
systemd[1]: Started Process Core Dump (PID 2496/UID 0).
systemd-coredump[2497]: [🡕] Process 1319 (NetworkManager) of user 0 dumped core.
Stack trace of thread 1319:
#0 0x00007fd00fe91dec __pthread_kill_implementation (libc.so.6 + 0x91dec)
#1 0x00007fd00fe3f0c6 raise (libc.so.6 + 0x3f0c6)
#2 0x00007fd00fe268d7 abort (libc.so.6 + 0x268d7)
...
I see two other topics that show a similar problem.
I did install the debugsources of the relevant libs but I wonder what to do, open a bug at bugzilla.opensuse.org?
Would like to give it some follow-up this afternoon.