Hi All,

It's my first post here.

I've bought BaseBox 2 with additional 802.11 ac card (R11e-5HacD). Updated to RouterOS 6.21rc5 and set both wireless interfaces to "ap bridge" mode.

When I'm connecting a laptop to 2.4 GHz interface everything is ok (ping and speedtest.org)
On the other hand on 5.0 GHz the laptop is setting up connection, receiving IP address and getting stable ping to a gateway. But when I'm trying to generate some more intense traffic (opening web page or so), ping goes from ~2 ms to 1500-1800 ms and then I'm getting just 'time out'. After restarting wi-fi interface on laptop, I'm back to my 'stable ping' situation.

What's wrong with this ac card?

Update:

I'm using two ACSWIM antenas
below interface config: