@NER1 What's the Controller version and your firmware version on EAPs? Can you confirm they're compatible w/ each other? You can go and check out their compatibility. It's listed in the Release Note....

@Johan69 SG2008 Will this be some kind of similar model? Compatible with OC ver 3.0

@Darren78 Check out the UG: OC UG, it's on 6.3.1

@ZandrM Can you check the ISP's line is stable? Ever contact the ISP to check the line? Try to use connect automatically.

@SudhirK Since LS105G is an unmanaged switch, yet 105E is a smart one. Did you check the port speed on the SG105E? 1. About the cable, CAT5e at least? 2. The cable length should be shorter. I...

@Adoril Refer to this step 2: https://www.tp-link.com/us/support/faq/3091/ Think you did not get things right. They have a guide for this kind of setup.