rekordbox connection problem with prodjlink

Dear ALL
i am using rekordbox 3.3. and had no problem till few past weeks (2 weeks) where i started having problems in establishing a connection between my PC rekordbox and my DJM 900 , and 2 x CDJ 900 nexus.
The PC takes some time , around 2 min to establish a network connection via LAN, and Rekordbox almost 3 min afterwards to view CDJs.
When i load a first track to any of the CDJ, it plays normally around 3 to 4 second and then it goes into emergency loop, and afterwards if i load on the other player it displays LOADING ...... without really loading.

The problem is really frustrating, i have disabled my anti--virus, my firewall, and set my IPV4 properties to automatic IP address and automatic DNS< with DHCP enabled.

I kindly need your help on this as i have more than 25 GB of music sorted out on Rekordbox and cannot afford to re-install the said software .

I have tried to connect one of the 2 players directly via LAN and got the same result.

every time i try to diagnose the local area connection, it gives me "Local area connection IP address fault " noting that Pioneer players required automatic IP so there is no special configuration to make

I tried logging with another PC and it was working fine.
Also playing from a playlist loaded from Rekordbox would really rock the hub switch and have no problem while playing with USB.

I need some serious help to re-establish the status of my software

Paul G Ghanimeh