Using OBS on a clean, well maintained Win10 system (not running as local admin, unnecessary services and processes disabled from auto-starting, etc), I found OBS's auto-reconnect to work perfectly well for OBS. So well, then when I was having upload limit issues, I shortened the default retry time from 5 down to 3 seconds, and always re-connected immediately (first try)
So if you are having an issue, it is likely
- your PC
- an OBS plugin
- your network
running Qty 6 OBS instances, consuming 100% of available upload bandwidth, I'd expect real problems.... real fix ... either become very knowledgeable about optimizing a network (TCP, etc) or give yourself some headroom (stop trying to come close to 100% upload utilization..).
How much of your upload capacity can you use? depends on your setup and your ISP.. there is no 'correct for most people' answer (without being super conservative way under-estimating). you'll need to experiment and find out for yourself. My PC and my ISP is fine at 80%, and I wouldn't try higher. Others fail at much lower rates. ymmv