VEMS Install Bluetooth Problems

[Dreamer52]

I'm trying to install a VEMS ECU on my 89 911. I've been having connectivity issues since day one. First you pair then could connect, then not connect, then connect later. I have never lost connectivity once I was connected, only later after I disconnected and tried to reconnect. There has been no 1 repeatable incident that I can put my finger on replicate the incident. Yesterday I installed the TPS, connected via Bluretooth to ensure it was working properly, then finished the TPS install (MAF & air box). I later tried to connect and now I am unable. I have tested for power and the unit is getting 12v.

Just trying to find out if anyone has some trouble shooting advice

Thx