The Dell VRP100 (VR118) headset comes in a package with two controllers made to be used with Windows PCs. It is Dell’s first virtual reality device and was released in October 2017.
Try plugging your bluetooth v4 dongle in another port, or make sure no other devices are connected over bluetooth.
I had a similar problem when i connected my bluetooth speakers over bt, either a controller would stop working even if connecter, or bt sound was weird.