Hi @ All,
I had the same issues the days.
One of our customers change his devices from Symbol MC9090 to Zebra TC8000.
Since them, there was no day without trouble
1. Limit the band for the used SSID to 2.4 GHz (AP & Device)
There is no need to use 5 GHz, lower distance, more noise.
The only one is the higher speed … no need for MDE.
2. Limit the bandwidth to 1 – 2 MBit, the device should only connect over 11b. (AP)
3. Use only channel 1,6,11 for the 2.4 GHz on the AP.
If possible don’t use channel negotiation, setup the APs to use a fix channel.
Also, setup the devices to use only these three channels.
4. Don’t use automatic transmit power control.
Never use more than 20 dBm inclusive antenna.
My best experience is ~ 18 dBm. Use external antennas if possible.
5. Disable 802.11r, 802.11k, 802.11v on the used SSID.
6. Disable any WiFi power management on the Device (always on).
7. Update the Devices to the latest firmware.
Specially for Zebra Devices with Android OS, there is another option to make special WiFi-Setting.
See Link below.
http://techdocs.zebra.com/mx/wif
Best regards from Germany Alexander
P.S. The Zebra TC8000 use only these four 5GHz channels, 36, 40, 44, 48, per default, the rest is not enable. ☹
P.S.P.S. These tricks also works for roaming problems with iOS and other android smartphones. :-)