Amp keeps shutting off


I have the Schiit Vidar powering two 98db 1w/1m speakers. This thing will turn into fault mode so quick once turned up. Only using 4-10 watts per channel, it will turn off after 20min with a box fan blowing on it. I took the cover of the amp off, which I didn't want to do, and that didn't help at all (again with a box fan blowing on it). Once using anything above the 30 watt per channel range, the thing will last 1 minute before shutting off (although that 1 minute sounds really good). The amp is rated for 100w RMS per channel into 8 ohms. I'm not expecting it to actually sustain that rated power, but come on. Why isn't it at least sustaining 20 or 30 or even 10? Am I doing something wrong? Or am I out of luck?
oedstrom11
I had a similar issue with an Aegir using efficient speakers, and they sent me another one that also shut off weirdly (not as frequent as the first, but still)...sent it back. Could have been triggered by my "stacking" REL sub cables (2) on the outputs along with the main speaker load (RELs supposedly add a very high impedance load so they should be transparent to the amp), but that's never been an issue with any other SS or tube amp I've used this way...oh well. Send the Vidar back as the Schiit folks won't mind. 
If you can change the speakers cables do so I think they’re shorten 
try to connect only one speaker to the back of the amp and play
just take one cable out and viceversa 
im 💯 sure is shorten