There is a NAS cluster gateway with two NAS 5320 appliance. In one head, there was a problem with NAS os in the flash disk. So we replaced the flash disk in Head2 and upgrade the NAS os corresponding to Head1. After that done all the configuration in Head2 as like Head1. Now both heads are in cluster and showing Normal state. But sometimes users can't access Head2, but at that time it is accessible with gui/telnet session. Now version of both heads showing, Head1- version 4.22 M1 (Build 65I22RO) Head2- version 4.22 M1 (Build 65).
Some mismatch is there with builld. Whether this is the problem?