Amp keeps shutting off

From your Owner’s Manual:

ClEARINg FAUlTS
Okay, so you have a flashing light. Deep breath. We’ll get this taken care of shortly.
When the Vidar’s front light flashes during operation (and the amp mutes), or if it never stops flashing after you turn on the amp, there’s a problem, or fault. There are three kinds of faults:
1. Over-temperature. The heatsinks are too hot, and Vidar has shut down to protect its output. If the amp is very hot, turn it off, wait a while for it to cool down, and try turning it on again.
2. Over-current. If Vidar is connected to very low-impedance speakers (2 ohms in stereo, or
4 ohms in mono), playing very loud music can cause an over-current condition. Simply turn the amp off and on again to clear this fault.
Alternately, Vidar may shut off from over-current if the speaker cables are shorted. To trouble- shoot this, turn off the amp, disconnect the speaker cables from the amp, and turn it back on again. If it comes back on, there may be a short in your speaker cables (or your speakers). Examine your connections to ensure there are no stray wires or shorts. Once those have been fixed, you can reconnect the speakers and play music again.
3. High DC offset. Vidar is a DC-coupled amp. Its microprocessor monitors DC levels at the output and adjusts it down to zero. However, it may not be able to correct for high DC from your source (such as a preamp). To clear this fault, turn off the amp, disconnect the RCA cables or XLR cable from the amp, and turn it back on again. If the amp turns on normally, then there may be high DC on the output of your source. Have the source inspected and repaired.

Had an issue with a Primare amp randomly going into fault shut down, couldn’t figure it out. Manufacturer rep was very helpful, suggested it could be DC in the AC (from other devices leaking into home AC). That was confirmed by torroid transformer hum. Maybe that’s your situation?

Power off and on reset, for awhile. Got a DC filter from Emotive (only such filter i found). Surprised that other filter devices didn't filter out stray DC.

I am going to say this as nice as i can but a lot of today's so called high efficiency designs have severe impedance dips in the bass and it is this reason that i believe that the amp is shutting off because low power consumption small amps do not have the current to tackle the low impedance. Try a vintage beast amp at least twenty years old and see what happens but my guess is that one like that will drive your speakers beautifully.

After trying search all posts to find what speakers the OP has, I believe it’s the speakers, causing amp shutdown.
As every post the OP does says nothing about what speakers he has, mentions models of everything else, the only thing said by the OP about the speakers he has is that they are

" My speakers take 200w continuous with peaks to 800w or 1000w"

Something just don’t smell right here.

Cheers George

The Klipsch Epic CF 2. It’s a bright set of speakers that just need to be tamed. The spec sheet says as I wrote, 200w continuous, 800w peak. The Vidar has smoothed them out nicely, although I still have improvements to make. The speakers have never caused an amp to shutdown as the Vidar has in their 25 years of use. I don’t expect that to randomly change.