Hi, you are welcome! Interesting about the random reboots. One thing I did not mention in this thread before. A couple months ago, I tried an RX 5700 that became available in my household. It worked fine at first, so I thought. But, I started to experience the reboot\sleep panic issues the first time it went to sleep that night. I found some others having this issue with this card, but nothing I could find or tried would solve the issue (latest LILO\WEG, darkwake settings, command line arguments etc.). I thought perhaps a borderline underrated power supply may be the issue, but it didn't make sense that it could pass a benchmark, but then fail to wake. Never got it sorted...
Anyhow, I put my RX 560 card back in and all the issues went away, stable as ever. Since you are using the Nvidia GT 740, I wouldn't think the issues would be directly related to the ones I had with the RX 5700. But, it makes you wonder since the symptoms are very similar to the ones I was having. Let me know if you ever do figure out a solution.
You are spot on about the USB ports. I have never needed to use the USB patch on this system.