Session exceeded configured max bytes to queue in IPS logs

Hi, I have read up many posts and for my case I am seeing the warning messages from IPS logs as well:

2019:10:18-09:57:01 dph-utm snort[20679]: S5: Pruned session from cache that was using 1060717 bytes (stale/timeout). x.x.x.x 62993 --> x.x.x.x 80 (0) : LWstate 0x9 LWFlags 0xe007

2019:10:18-13:12:01 dph-utm snort[20679]: S5: Session exceeded configured max bytes to queue 2621440 using 2626899 bytes (client queue). x.x.x.x 64743 --> x.x.x.x 80 (0) : LWstate 0x9 LWFlags 0x6007

Initially there were more of such messages but after increasing the max queue byte size and queue length, the warning messages frequency reduced but does not go away entirely. Does anyone here face the same issue?

cc set ips snortsettings max_queued_bytes 2621440

cc set ips queue_length 8192

https://community.sophos.com/products/unified-threat-management/f/network-protection-firewall-nat-qos-ips/79574/seeing-session-exceeded-configured-max-bytes-to-queue-in-ips-logs