You need to mitigate the Azure Cache for Redis issue.

Increase the maxmemory-reserved and maxfragmenTationmemory-reserved values

Modify the maxmemory policy to evict the least frequently used keys out of all keys.

Configure client connections to retry commands with exponential backoff.

Test application code by purging the cache in the test environment.

Test application code by rebooting all nodes in the test environment.