Trunk ports shutting down

So I have two switches that are on opposite ends of the business site. We'll call them Switch A and B. Switch A is in a new building, has a basic set up to allow connectivity on the network and is pretty new. It connects back to our mdf via fiber connection to a switch we'll call switch C. Switch B is in an office and the purpose for it will be for desks with phones to connect to via POE and it has a fiber link that connects to another switch in the same space and then that switch (we'll call this switch D) connects back to switch C. Now, sometimes the trunk port will just disable and in order to get it back up, i need to power cycle the switch and it comes back up fine. I don't see anything in the logs other than the port went down. I checked the transceivers and they are the netgear transceivers and each end shows the right type. I tried moving ports but same behavior. Usually, after power cycle, the switch would stay on from a few days to a few weeks but today, it goes down anywhere from a few minutes to a few hours. We have quite a few netgear switches and these are the only two doing it.