I have 26.5.2 Tahoe OS and have two other Pegasus RAIDs (3 R4 and a 32 R4) connecting with no issue. I have a Pegasus R4 that will connect for a short time then drop. No sleep mode.  No reason is apparent when the R4  drops.

I snapped a pic of the current firmware on  the R4 is= 5.04.0000.64

the other two are 6.06.0000.45

I feel certain this can be resolved. I am not sure what I have done that might be the issue. TYIA