Yes the receiver is replaceable but it is built onto the main logic
board. However there's a good chance the receiver isn't the problem.
Usually receiver problems don't come & go. When they're bad, they stay
bad until they are replaced.

It sounds like it's an interference problem that comes & goes as
something is being turned on & off. The interference could be inside or
outside your home. Common causes are police scanners, ham radios, cell
phone towers, older large satellite dishes, and more recently military
radios. So changing the receiver or even replacing the opener may not
solve the problem if it is on the same 390 frequency that your opener
is currently on. Genie, Liftmaster, Chamberlain, Craftsman & others
have been using this freq for years in the US. The Liftmaster openers
that have just started to come out recently (last couple of months) are
now on the 315 freq (used in Central & South America for years) to get
away from the military radio interference problem. I do not know if the
other brands are on the new freq yet or not but some places may not
have ran out of the 390 freq units yet.

Unfortunately if the interference is outside of the home it can
sometimes be difficult for the average person to determine where the
problem is coming from. Do other people in your area have the same
problem or is it only your house? If you are the only one turn off
every breaker in your house except for the opener circuit & see if the
problem goes away. If so turn them back on one at a time & see what
circuit(s) causes the problem & then what is on the circuit.

You wouldn't be the first to spend money & then find out the money
spent didn't solve the problem.

A more drastic test is to take the opener down & take it to a different
area. Plug it in & see if the problem goes away.

Doordoc
www.DoorsAndOpeners.com