https://dccwiki.com/QSI_Decoder_Resets_on_Startup FAQ:QSI Decoder Resets on Startup - DCCWiki

FAQ:QSI Decoder Resets on Startup

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DCC Categories Multifunction Decoder
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If a QSI multifunction Decoder resets upon startup, the reed switch used for this purpose has failed and is in a closed position.

Remove the reed switch and the decoder should work as normal.