Could be a gateway issue also, or an issue with the radio the gateway is connected to. I had one that would occasionally cycle to X and then repeatedly cycle to X. We are using MIP 5000 gateways connected to rack-mounted APX 7500 mid power mobiles. Long story short, it was the power supply for the mobile flaking out. A couple weekends ago I also had one completely lock up, radio and all. A trip to the site, a couple power cycles and a reseat of the network patch cord and its been fine ever since.
Unfortunately experience has taught me that the MIP can be a finicky beast, and there are a lot of "moving parts" involved especially when you are connecting your consoles to your gateways through a big, busy LAN.