Having used the XE75 3-pack (HW version 1.0) now for a couple of weeks, here's my subjective experience: Once it latches on to 160 MHz successfully, it stays there pretty much indefinitely. At least...

Does this happen regardless of hardware version (i.e. different chipsets / firmware)? I ask this based on the following observation: I originally ordered a 2-pack of XE75. I had it up and running for...