@Hank21 Port (interface) speed was remain same if connected directly to laptop. As well Hard reset the CP 710. But no luck.

AP to POE was 51 Meters & POE to Switch 45 Meters.

  @Hank21 I tried the above process but no luck. So, I working new method.

Distance between CPE 710 to Switch is 96 Meters

Step:- 1 Replacing the all cables from CAT6 to CAT 7a

Step:- 2 CPE 710 to POE was 50 Meters 

Step:- 3 POE to Switch (Unmanaged Dummy Switch) was 0.5 Meter

Step:- 4 Switch (Unmanaged Dummy Switch) to Switch (Core L3 Switch) was 45 Meters

Is above step will work (have to carry 10 VLAN traffic) ?

It is like there might be a mismatch between the expected and actual performance. Double-check the settings  Lash Lift Collection to ensure the interface is configured correctly, and consider updating the firmware if available. If the issue persists, reaching out to support might be the next best step.

  @Hank21 After replacing the Cables, CPE 710 (Access Point) issue was resolved and now interface speed was 1000Mbps. But on CPE 710 (Client) Interface speed only 100 Mbps. Now I have a two issues.

Interface Speed was 100 Mpbs on Client 

Bandwidth between the devices wasn't expecteed.