I had this issue too. You do not have to do a fresh install of Bms 4.33 as there is no bug.There are three simple things mentioned before now that works for me.
1. Set your Antenna to Aft when you launch weapon
2. Turn your aircraft away from the target and put the weapon on your side. Confirm this by looking at your HSD, there is line pointing from you datalink pod to the weapon in flight. You may have to zoom in to see this on the HSD
3. Maintain a stable flight to preventing your wing or part of aircraft from blocking the link from your datalink pod and the weapon. Anytime no signal is displayed, roll level and signal will be back. Constant signal is key to success with this weapon. However to guide against lost of signal, put the bomb in terminal mode and arm the fuse in time, with this the bomb will fly straight to target and detonate even if there is signal loss for whatever reason.
This steps works for me and hope you get it to work too.