100% RAM usage and crashes - Squid Problem

[lfirewall1243]

Hi,

i have a small Firewall with an Celeron J1900 and 8 GB RAM.
Without any special services, just some FIrewall Rules.

But the System keeps crashing, i cant enter the WebUI until i restart all services over the Console. After that i can access it but the RAM and SWAP usage is at 99%.

IDK what to do :/

After a reboot its okay for some days, but than the system crashes :/

[lfirewall1243]

UPDATE:

i attached some screenshots of the "top" command and the RAM usage on the UI.
I dont know if theses values are normal

maybe someone can help

Edit:
I think the problem is Squid, look how many "pinger" processes are runnning (squid ist deactivated)