mb1 keeps rebooting when rf is increased
when it gets to around 65 watts
ruining windows 10 and one having similar

Sounds like RF is getting into your MB1 maybe. Have you tried a dummy load to see what happens?

73
Hans Christian LA9AKA

The first thing I would try is apply new thermal paste to the cpu.
Chances are that the thermal paste is dry and crusty no longer good or it may not be covering the entire surface area of the cpu.
The cpu is more than likely overheating. The MB1 will continue to go thru a reboot process and shutdown over and over again.
Even a very small dot of thermal paste not being covered on the cpu can cause this to happen.

You can purchase the thermal paste on Amazon for roughly $7. ARCTIC MX-6 (4 g, incl. 6 MX Cleaner) - Ultimate Performance Thermal Paste for CPU.
The cleaning wipes are very effective. But you better be outside or in a very well ventilated area to use them. Make sure you clean off all of the old thermal paste from both the cpu processor and the fan heatsink. After that's done then you can reapply new thermal paste. You can use a credit card to spread the paste evenly across the surface of the cpu.

I attached 2 screenshots from the manual/addendum that was published sometime ago.
The other photo you can see that there was some spots not covered by thermal paste.

Good luck let us know how it goes.

73 KE7HOP LEVI

Addendum procedure for for applying thermal paste to the cpu.

How will thermal past interact with rf?serioues??

As RF power is increased the heat generated inside the MB1 increases overall. That heat inside the MB1 case will eventually transfer over to the other bays and add additional heat to the cpu. The MB1 utility can help with this issue if you have the fans set to High or Turbo. It will help exhaust the heat from the RF deck heatsink. And may be just enough air flow to keep the cpu from overheating. But if the thermal paste is not doing its job, the cpu processor temperature can easily exceed 40°C under light processing load or at idle. The MB1 will reboot or shutdown if it exceeds a certain temperature threshold. Each temperature threshold will be a little bit different depending on which cpu processor is installed on your MB1. Mine is I7 9700. Under heavy overclocking stress tests on the cpu and using a thermal IR gun I was able to determine that the cpu was overheating at a relatively low temperature and forcing the MB1 into a reboot cycle. Once i reapplied new thermal paste to the cpu all of my issues vanished. On numerous 30 minute cpu stress tests while running 100 watt QSOs The MB1 did not randomly reboot or shutdown. The max temperature reached by the cpu was 79°C. I had the fans on the turbo setting running the entire time.