XWRT-Vortex 380.57 on R7000 problems with IPTraffic and 2.4GHz WiFi

Running the R7000 with R7000_378.55_2 works as expected:
Enabling IPTraffic(per IP monitoring) will automatically disable HW acceleration (as reported on the Tools->SysInfo tab).
Router seems to be stable without any issues.

Running the R7000 with R7000_378.56_2 has problems:
Enabling IPTraffic(per IP monitoring) doesn't automatically disable HW acceleration (as reported on the Tools->SysInfo tab).
HW acceleration manually disabled (LAN->Switch Control->NAT Acceleration), since per IP...

XWRT-Vortex 380.57 on R7000 problems with IPTraffic and 2.4GHz WiFi