I have an ASR 10 rack and, in more than 15 years, have never had such a problem. All I can suggest is to connect one SCSI device at a time and see what happen.
Good luck
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.