Hi experts,
my DDWRT firmware is v3.0-r44191 std (08/15/20), and router is TP-Link TL-WDR4300
nextcloud latest version is the only application in my raspberry pi 4 (2GB,raspbian lite,latest version), I assigned 1GB memory to php
I installed nextcloud client in my desktop pc to sync files
nextcloud ran smooth at first day, then my network kept unstable. I ping the raspberry via my desktop under the same home wifi, sometime is under 15ms,sometimes is above 300ms. I turn off raspberry, my network will be stable(<15ms) again.