2.6.7 - Shares per minute drop substantially after a short period.
Works perfectly for about 10 minutes. Then shares per minute drops to about 20% of what's expected. Only way to bring it back to normal is a full restart of the process. There's no errors, but number of miners keep growing and growing. Tested on 2.6.6 also, and the same issue there.

Using pm2 and maxMinersPerConnection 100, on a $20 DO box.