For a remote location I manage the network, including wifi for production use. There are 7 switches (C2950), 11 accesspoints (C1240), 3 wifi-connected printers and 28 handheld wifi terminals (LXE) running a version of Windows CE. The terminals authenticate to an ACS using LEAP.
Periodically, the handheld terminals experience bad responsetimes within the application they use. This is a telnet application, very little data, connected to a SAP system where multiple other people make use of with a regular desktop SAP-client without response-problems.
The problems get fixed after a reload of either all switches or all accesspoints. This means if you reload all switches the problem gets fixed, but it also gets fixed if you reboot the accesspoints and leaving the switches alone.
The accesspoints are fairly new, about a year old. The switches are somewhat older, about 5 years. I recently upgraded the firmware on the switches, which did nothing to solve the issue. I can't find anything errorlike in the logs, before and after the reloads.
Where should I look for the problem?