Sometimes we suffer from terribly slow Wi-Fi speed down to 5Mbps on 5GHz channels.
We use Mikrotik router (with RouterOS 6.49.6) with CapsMan for managing 8 cAPs (Miktotik cAP AC) with roaming enabled. CapsMan configuration is attached.
Normally we get 100-200 Mbps on laptop connections, but sometimes laptop connections drop to 5-10 Mbps on one cAP or another. All laptops connected to that cAP suffer the same slow connection. Meanwhile we have never seen more than 20 clients connected to any cAP at once. Furthermore, number of clients does not influence cAP. I tried switching clients off cAP that suffer from terrible slow speed and ended with single client still suffering slow speed. Others laptops connected to other cAPs are not effected. We have noticed that 3 of 8 our cAPs sometimes drop their speed in that manner. After a while (ten minutes or half an hour) cAP regains speed to normal 100-200 Mbps. Sometimes we have no time to wait and hard reset cAP. After hard reset cAP always works fine with normal 100-200 Mbps.
What may be a culprit or what should I examine else ?
Thanks in advance for your help.