I am trying to conect a OWC ministack STX with a hard drive to the second port of one of my Pegasus R3 4s. The R3 seems to constantly power cycle. If I connect the R3 and STX to seperate ports on my imac 19 2019 they both seem to work fine. I'm suspecting the OWC product is not really thunderbolt 3 compatible. 

 

Anyone done this? 

 

thanks