That’s just one possible reason for the reconnects. In my case, I only use 2.4 GHz networks. No roaming between 2.4 GHz and 5 GHz or between different access points. There are just reconnects even when having 100% signal - other devices on the same network have a stable connection all the time.
Not all people can do that because they are affected by the “wifi band switcher becomes invisible”-bug. Same do I. So there is no chance to switch or disable wifi bands 
Let’s all hope for the release of the new OS version! 