SLink trouble SQ5

SQ-5 Slink out of connection!
SQ-5 (latest FW update) connected via good cable to DX 168 (cascade mode) has worked well for 1 week.
Now: Slink error on DX168 and flashing Slink at the SQ-5
Multiple options of changing cables or booting sequence have not helped.
Any Idea?
How can I test the Slink Port on the SQ-5?
(reload of FW had no effect too)
Thanks for your suggestions.

Hi Christian,

Please start a ticket at support.allen-heath.com and we will look into this further for you.

Thanks

Alex