@craz sure it would be nice if MT76 on this router was stable. But it is "snapshot" builds after all and are likely to break sometimes. So either try to be constructive or else please don't comment. nbd and others is doing this for free and I really appreciate that!
Currently it seems to be the changes being implemented to do "CCMP PN validation" in the driver that are breaking MT7603. Without these related commits it's seems perfectly stable as when using my own test branch.
Btw I'm also running with 4.4 kernel as suggested by @neheb to see if it cures the seldom happening random reboots that I have experienced recently (I have not had an uptime for more than approx 10 days).