Basically all that error is saying that the HaLowLink1 can’t access https://repo.apps.morsemicro.com . It sounds like there may be something going on with your routing which could be causing the disconnects. See Intermittent disconnects which is a follow up disconnect for some of those intermittent disconnects.
If you’re still having issues, the 2.7.4 release can be downloaded directly from https://repo.apps.morsemicro.com/openwrt/releases/latest/targets/ramips/mt7621/openwrt-morse-2.7.4-halowlink1.bin
The source be available on GitHub in the next few days.