[tor-relays] Failing: 4063 Connection error

Where can I set the connection limit higher or is this a result of max bandwidth allowed? This relay was up for over a year with no issues, however since updating the Tor version it's been problematic at best. Thanks. Linux version 2.6.32-042stab125.5 (root@kbuild-rh6-x64.eng.sw.ru) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Tue Oct 17 12:48:22 MSK 2017

Tor version 0.3.1.9

:Failing because we have 4063 connections already. Please read doc/TUNING for guidance. [over 16000001 similar message(s) suppressed in last 21600 seconds]