I have a sirius streamer replay and yeah mine does it too. I have to push it down into the mounting bracket on the left side or sometimes wiggle it out a little. My wires plug into the bracket then the radio slides into the bracket, I've already replaced the bracket once. When I talked with them it seems this is an ongoing problem with the streamer replay.
Which radio do you have? By the way good luck with customer service they pass the buck and it took a few calls to get mine in the mail. I'm thinking of putting a little superglue in the frontside ,so I can cut them back apart if it don't quit, it is quite aggravating.
I bought a lifetime membership a couple of years ago. When my first radio died last summer, I bought this one and they wanted 75.00 to activate my new one. I `argued that it was their p.o.s. radio that died and they waved the fee. They said my "lifetime memebership" is only good for 3 radios total too. When 2 more of their crappy equipment fail my "lifetime" membership is done.