Rly the only solution is to get an ssd?
Just had a one question. My Riggs sometimes restarts and when they do, after restart they enter in bios because the USB isn't recognized. I have to manually replug USB and then it boots up again.
I have a AsRock h110 BTC+ board and a 3.0 16gb usb stick
If you haven't tried this already, go into bios, under the "Boot" tab you have setting for "Fast Boot", set this to "Disabled". You can also increase "Setup Prompt Timeout" to 2 or 3 seconds. If that doesn't help you would have to try another USB stick (or buy the cheapest SSD).
So, is it freezing problem or is it system not detecting USB stick when it restarts, or both?
Have you tried the bios settings that I suggested?
Now, about the freezing... (which would eventually trigger the watchdog to reboot the system...). If it haapens with different motherboards and different USB's, getting a SSD wouldn't help much if something else is causing the freezing. There are few things that could cause freezing (most common):
1. excessive overclocking - reduce overclock, increase power limit
2. bad risers - replace riser
3. power strugle - make sure you don't draw more than 80% of the listed power supply rating; don't connect more than 2 risers to one SATA cable (eventually 3 for for 1050's and 1060's); check for loose connections
4. bad GPU - disconnect one by one to troubleshoot
5. bad USB stick or slow USB stick - replace it
6. bad bios setting - load default/optimized settings, enable 4g, set to (Gen1 or Gen2), disable on-board video
7. bad/damaged image of nvOC - reimage
8. bug in nvOC - update to the latest version
Give more details, error messages, screenshots, OC values. It's not easy to troubleshoot blindly