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no quick fix there. Dealer would be best option. There have been many issues with the STS, XTS CTS, and ATS radios. Most problems relate to XM radio, but the issue you mentioned seems to lean toward the "replace it" path. Best to check with a dealership to see if there is a recall.
Sounds like it's inside the radio, unless they mean an in-line fuse holder on the power wire leading into your radio. I would ask them again. I don't think removing battery would help, but no harm in trying. Just take off your negative cable from battery, and it will be totally "as if" removed.
Bad TSOP flash chip. No way to fix without disassembling, removing the flash chip, and placing a new flash chip on it. Doing so requires a donor radio (with another issue), and will change your XM Radio ID. You'll also need to have a hot air (or IR) rework station for desoldering the old chip, and a soldering iron for placing the new chip on the radio. I'd say give pioneer a call since it's a design flaw, and a VERY common issue. My best guess is that it's caused by excessive heat & defective chips.
I had this problem for the last 2 weeks, didn't think much of it, but recently the car radio just turned on and off by itself, it decided to do so whilst the car was switched off and it drained my battery. After doing some tests with the Amp meter and removing the fuses for the radio and infotainment system the amps going through the batter went from about 0.7 to 0.001 (far more accpetable) - so the radio was draining the battery and randomly turning itself on/changing stations and the internal display system had stopped working.
after putting the fuses back in and re-testing the radio worked fine (almost like it had a full reset - no random turning on and off OR changing of radio stations)
the fuse box for my astra was next to the battery under the bonnet (see your car manual - I had lost mine so googled for it)
but it seems yanking the fuses for the radio (FUSE number 35 and 36) seemed to fix it (been a few days and no flat battery) -
It maybe an intermitent fault, in which case i'll have it looked into, but as garages charge an arm and a leg i'd give this solution a go and if your battery is good all you need to do is remove the fuses and put them back after say a minute or so)