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.
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