TC70 WIFI issues

We have TC70 Scanners running a mix of Lollipop/Marshmallow OS and we keep running into issues in our warehouse where the device shows full connectivity in terms of "WIFI BARS" but does the application shows signs of lagging (application shows spinning circle like its loading).. Warehouse workers keep saying device is "losing the wifi connection" when in reality it never disconnects from the wifi...

Is there any logging, tracing we can do to see if its WIFI related or application related?