[Sync Source] in the [Sync Common] setting category of the GLOBAL menu is set to [DIN MIDI] or [USB MIDI], but the SQUID starts/stops by the MIDI signal start/stop message.

This unit can control the sequences by receiving MIDI signal start/stop messages from the MIDI IN terminal or USB-B terminal regardless of the [Sync Source] setting value.
To disable the start/stop control of MIDI signals, go to the GLOBAL menu >[MIDI IN] setting category > [Start/Stop] and select [Disable].