Hello I made an account just to confirm I have the same problem!
With almost the same CPU, I can play the game for about 30 Minutes with (30 - 50) FPS untill I get a freeze for 1-2 Minutes usually after that it gets back on. The game never crashed for me so far.
When the FREEZE is comming, the CPU usage cuts down to 5% ; RAM stays the same ; and GPU goes down to 0%. So I guess CPU stops sending data to GPU and it wont process anything.
During that time I can hear stuttering from the Squad channels and some sounds are looping. I will get about 0-2 FPS and eventually a freeze where everything cuts of and I have a standing picture and no sound.
My Squad is clean installed, the cache is wiped today and playing in the Video Options doesnt change anything.
My Specs, with Squad running on SSD:
(*while in Squad 80 man server, 50 Ping)
Windows 10 64bit
AMD FX-8320 Eight Core - (almost like OP) (55% Usage*)
8 GB Ram (92% Usage*)
NVIDIA GTX 970 (40% Usage*)
Im gonna try some things and if I have succes with anything I come back here.
I hope this is of any help!
Greetings Rocket Bunny