Lowrance HD9 Live powers off

[scobar]

Lowrance HD 9

Seems to get pretty hot then shuts down, its on the dash behind the windshield but fully open besides the windshield.

It is fused to a group 31 battery that also powers 2 riggers, nothing else on the battery. It does not shut down or show interference when riggers are running. The screen is almost too hot to touch. I'm thinking it shuts down due to heat but want to see if anyone has similar problems. I am planning on shading to windshield.  

thanks Scott