I also went on 1.0.7.18 but I had to stop using 4G.

First of all, it doesn't go on 4G as often as it should. My Z10 was almost always on 4G, the Jolla is rarely on it.
Second a few times it showed full 4G signal but my phone was not reachable to calls until I either turn it off or someone re-connect to the GSM network.
I have it now in 3G.

so there seem to still be work going on.

The whole WiFi/4G/3G/weak signals etc is putting the connman daemon under stress and it does not seem to handle it very well yet.