WebUI won't respond, router keeps working

[TK_Liew]

@eben, please try this firmware to confirm it helps.

Introducing Firmware 8.1.1!

@ekonikoff, you may try https://download.peplink.com/firmware/plb30/fw-b20_30-8.1.1s048-build4990.bin. It is based on 8.1.1s017 with more enhancement.