Untangle 9.2.1 lite version slows internet

Hi,

We have Untangle 9.2.1 lite version installed it worked good for one year but but now a days it slows internet randomly we observed number of sessions, cpu utilization seems good at the time of internet browsing slowness

For time being we switch off each module step by step & make it switch on step by step after 10 to 15 minutes then its works fine

We have following modules in Untangle

Web Filter lite

Virus Blocker Lite

Spyware blocker

Application control lite

Intrusion prevention

Also please let me know what is default credential for root for getting access of reports using command line

So please suggest solution

Thanks
Niljos