Sounds like a swarm of crickets on meth, a squeaky/squealing sound from the front when I take my foot of the gas and the engine is slowing the car down, I need to be above 35MPH when I start slowing down.
Rims are not hot to the touch (actually not pressing the brakes just legs off the gas pedal) so I think this is something from under the hood or the front wheels.

The only problem is, it happens every other week but once I get to a stop, switch off the ingition and start again. Noise gone for another two weeks. This makes it difficult to diagnose.

Any ideas? Just under 90,000 miles