Try redeploying your Redis instance, then redeploy both n8n instances.

What do the n8n crash logs say?

should I restart primary and worker also ?

Yes.

do I need to redeploy after restarting.

actually I redeployed them yesterday, but when I click on n8n link and signing into my account it says my user and password is wrong.

Redeploy/restart is kind of the same thing in this context…