I have noticed similar things but never been able to pin down what is causing it. The symptom seems to be that the "client" Mikrotik stops seeing the beacons (or at least that is what the log says) and takes up to around a minute to re-connect. At the "AP" end (also a Mikrotik) all the log shows is a disconnect/re-connect at the time when the client re-connects.
I do not see this happen with all my client Mikrotiks but with certain ones. I am sure the excuse given would be interference, but I am far from convinced. In one case, the AP Mikrotik has three clients attached to it, two are Osbridge 5XLi units and one is a Mikrotik. All three clients are within 50m of each other. I never see disconnects with the Osbridge units but see constantly with the Mikrotik. Even more bizzare is that the Mikrotik does its thing every 3.5 hours (ish) almost without fail. To me that seems to be more of a software timer type issue than a wireless interference issue (which would be much more random). This is also using 5.8GHz not 2.4GHz, so it is not household wifi causing it.