Well that for sure sounds like a bug related to the MR16. If you can upgrade them hardware wise I would recommend doing so, those are ancient and I had nothing but problems with them on 25.X code.
If you can't upgrade them hardware wise, then see if you can get support to downgrade them to the latest 24.X firmware version that was released. Mine ran fine on that code, 25.X not so much.
Otherwise you have to wait for the next time they crap out, and then reach out to support, so that they can tshoot.
I can save you some time though, because they are going to tell you to upgrade to 25.14 or 26.4 lol