We moved into a brand new house, new subdivision, Chrous installed a Type 300 ONT.  The first few days after installation we had quite a few link downs on the ONT LAN1 port (not pppoe related, this is the actual LAN port going down for a few seconds) - I assumed it was due to updates and the ONT rebooting itself.  However after a couple months, still have same problem, although its usually once a week.  It's just happened again just now and is a bit of an annoyance as I work from home a lot and causes Zoom calls and RDP sessions etc... to drop when it does happen.  The router I'm using is a Mikrotik RB3011UiAS.  ISP is voyager - but I don't think the router or ISP is the problem.

At our old place we had one of the older ONT's a Type 200 and using exactly the same router but configured for Spark, and we never had any disconnects, had link uptime of more than a month some times, the only time anything was reset was when we had powercuts.

Is this a known issue with the newer ONT's?