Please refer to the following URL for 3.0.3.10 version in Early Access.

https://together.jolla.com/question/...tes-303-hossa/

I will try to upgrade the 3.0.3.10 version by using the mautz's report #464 of the page 47(revision of #463 of the page 48, sorry ) on this weekend.
I hope to will be improved the mobile and wifi network connections.

Addition...

Well upgraded to 3.0.3.10.
I rebooted the system 3 times. The network connections are good.
The others are no trobles.

As you can know, sailfish os is 3.0.3.10. But the repos of hammerhead is base on 3.0.3.9 that mautz made.