Frequent disconnect (purple light) after 1.12.0.18

If the ring LED on the router is magenta, it means ithe connection between your orbi router and the exisitig modem/gateway is not stable. I would power-cycle the modem/gateway. Plug a laptop/computer directly into the modem/gateway and check if the connection is stable or not. I would check the logs as well. If it is a DSL modem/gateway, it might be getting disconnecting from the DSLAM servers. I would reset the modem/gateway if I see something strange in the logs. Once I have a stable connection from the modem, I would connect orbi router back with it, and check if the ring led turns magenta or not. If it does, power-cycle it once. It will refresh the whole network. It should work fine after that.