Max OTG WAN 5's issues

Hi,Just got this mobile router and I’ve been experiencing a lot of rubber banding on BF4 if my DSL modem is on WAN 5. If I use the modem’s WIFI AP to connect to the same DSL as Wifi as WAN, it’s smooth.I noticed the bandwidth over WAN5 is fluctuating like this

If it’s on Wifi as WAN it’s a big solid green area.I thought it’s the DIY CAT6e, but I replaced it width a premade one, same problem. Overriding the Outbound Policy other than the Auto doesn’t work. And upgrading to 6.1 firmware didn’t do anything either.Any insights?

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