Ok, since you only use the Simu 1 or 2 servers, it is due to the stability (immunity to interference) of the Internet line, which can be compensated for by VPN. The only thing I can think of is to check if your modem is already Docsis 3.1 capable. If necessary, change to a new modem that is capable of Docsis 3.1. P.S. Docsis 3.0 = download stable, upload instable , Docsis 3.1 = up & download stable (reduced packet latency, Improves voice quality for VoIP calls and online gaming experiences)
I just wanted to know about the servers, because there is a problem with the "ProMods"