Our microwave has some funny habits too!
It had to be replaced after nine months, but this one sometimes - not always - emits a sort of crackling noise when it's not working, and on standby...
I bought a new plug extension with a switch to turn it off when not in use, and a few weeks later, it's been a quiet as a mouse!
And the desk-top cooker has gone into a sulk, since I bought an air fryer, which is just fabulous!
Like garden tools, these appliances still have hearts - evil though they might be, if you don't look out...