The MikroTik hAP lite (RB941-2nD) model out of the box also suffered from a sudden reboot, but on all those offered at the office. The firmware site works flawlessly. Now it works properly on WebFig v6.33.3 (stable). The computer must be connected to the second port, otherwise it may lose the ability to connect both via ip and via winbox. There was a comment that the router did not configure itself out of the box for the provider, I had the same thing, even if your provider has auto settings, read the manuals on how to register the gateway! After adding the gateway in manual mode, everything worked for me, although the speed was initially cut terribly - despite the provider's auto settings.
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