Chord amplifier making weird noise (?)


I have a Chord SPM1200E 2 channel amplifier. Absolutely love it.
Since our recent move to Florida, it seems to have possibly developed an issue.
I think it is the amp, but not 100% sure.
I can't think of any other reason of what's happening, is happening.
1) The amp makes  a periodic low "cuffing sound" that comes through my speakers.
2) After it has played from anywhere  between 2-3 minutes to 30+,  it will make a high pitch distorted squeal, almost sounding like if you filled a balloon with air, then let the air out while squeezing the bladder , but much louder and distorted.
Again, the sound is coming through the speakers.
It is loud enough that I could seeing it possibly damaging my speakers.
The amp is currently disconnected
I can't think of any reason why this is happening.
It's very frustrating.
Before sending it in for possible  service, Does anyone have any thoughts on this?  
gomerpile1
Have you contacted the manufacturer? You can test away but if uncertain what you are doing, might be best to get it tested/serviced. 
If I disconnect the inputs and it doesn’t make the noise, that should indicate that it’s not the amp, correct? Any chance it could be an RCA input?
I hooked up a Parasound amp and had no issues.