Company VPN causes connection to drop every few seconds

Installed 17.0.1 on TP-Link Archer AC1750 ( a crappy router, BTW), normal wireless connection works fine. However, if I connected to company VPN (Cisco AnyConnect), it starts to disconnect and reconnect every few seconds after 3/4 hours. In other words, the first few hours are OK, but all of sudden, it starts disconnect then quickly reconnect (both VPN and wifi).

In the log it has this error message "Disconnected due to excessive missing ACKs". I googled a bit, added disassoc_low_ack option but didn't seem make a difference.

Any idea?

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