I have also with this kind of issue and open a TAC case, but only advised me to do PCAP using MAC ios or linux which in our side is hard to provide. In our previous engagement with PCAP, they also don't have any recommendation after we have given then the PCAP results. Meraki support is 1/5.
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@colinster We might just do that. I recently posted this: https://community.meraki.com/t5/Wireless-LAN/WLAN-speeds-suddenly-became-erratic/m-p/91249#M13427 I think reflecting on this thread might have given me the answer to what was going on. At one point in the last month or so I created a new RF profile which removes UNII-1 ranges. I applied this profile to two of the affected three stations. The plan had been to integrate a point to point Ubiquity shot which uses UNII -1 and I didnt want our Meraki stuff stepping on its toes. That ended up not happening (we found another solution) but in the meantime developed the problem in the above thread. What I didnt realize and now gather was that DFS prevents the use of some of those middle channels, so effectively there was some co-channel interference at 80mhz with UNII1 off limits. We changed to 40mhz channels and reenabled UNII1 on all APs and the speed issue seems to have disappeared. I think we could probably reenable 80mhz channels but I dont think it will make a huge difference for us in terms of speed as I cap WAN bandwidth at 150mbit and we aren't sending a lot of big files that would necessitate 80mhz wide channels. Does that all make sense to you?
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