I have TP-Link WR902AC V3 with OpenWrt 19.07.4 in client mode on 5GHz band, my download speed is limited to around 27mbps and upload to around 70mbps when the actual speed from the ISP is around 100mbps both up and down. I have managed to fix it many times (atleast temporarily) by messing around with the wireless settings. But the problem always comes back. What I have done :
Changing channel width from 80MHz default to 40MHz.
Using the option "Force 40MHz".
Changing the country to 00 - World.
Changing the operating mode to AC, N, Legacy.
Changing the channel to what my ISP runs at (channel 116) and to auto.
Un-checking the option "Disassociate On Low Acknowledgement".
Un-checking the option "Allow legacy 802.11b rates"
I have played around with most of the option that I think could potentially causes the problem and I pretty much have ran out of ideas. What do you think the problem is? I am beginning to think that Openwrt just doesn't run well on this router. I also initially did not have QoS/SQM installed, I do now but I haven't touched any settings there, so this wouldn't be the problem.
I'd be very glad if anyone can help me. This is really frustrating. Thanks.
I flashed Openwrt pretty much right away because the stock firmware has limitations such as limited number of wireless channels. I think there are only around 5 channels default and my ISP's channel 116 is not one of them.
But I managed to fix it again by changing the channel width to 20MHz, apply settings and changing it back to 40MHz but I am sure this will not be a permanent fix and the problem will come back eventually.
Not really, I however did not try to either. The other day, simply enabling the 2.4GHz band triggered it. I love to play around with routers but this one, I'm afraid to do so. I probably can recreate the problem again by changing some settings. Do you think this has more to do with the environment rather than the router itself?
Never tried to restart the wireless interface alone (I will next time) but I have restarted the router a lot of times when the problem happens which usually did not fix the problem. I wonder what causes this to happen.
Yes, basically I use my router as a wifi receiver to receive wifi from my ISP. And my router is wired to my PC. AP is not enabled. To make sure it's not the ISP issue, I simply connect my phone to the ISP's wifi and do a speedtest again, and I'm getting more than 100mbps. My phone is sitting next to my router when the test is done.