Could be a bad cable that is causing the link to go down. Are both devices showing active or is one still staying passive? If one is passive suspend the device and try swapping out the cable. If this does not work you may want to call into support to troubleshoot.
To suspend the device run the following command from CLI;
PA(passive)> request high-availability state suspend
To make functional after cable swap run;
PA(suspended)> request high-availability state functional
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