Hey Maartin did you solve your problem?.. I've had the exact same problem.. Well.. i didn't use the ti2 for a few weeks.. and i was thinking id use some sounds.. and i had the same problem you described. First the ti2 had noises and pops.. then i changed sound and it did do anything.. the BPM light was blinking.. weird symbols on the backlighted screen. i tried everything.. 3 different hubs.. extension cords different ports you name it I did it!.. So I tried using the virus in manual mode using midi cables and audio input and so on. How much did that suck??.. I was ok with the problem and faced the fact that the USB mode SUCKS and was going to record everything manual like i do on my other synts Nordlead 2, A1r and so on.. But when i recorder the ti2 sounds i realised that the recorded audio was slightly delayed!.. Im not gonna zoom in on every audio i record and "cut" of the silence and move the recorded audio to its place,,, My OLD nordlead and all other synths i have is EXACTLY on beat when i record these sounds.. some might say: just add "recording delay" in logic and ur set!.. but that means all my other synths will be recorded before the first bar! So it seems nothing is A ok with this ti2... But i just came home from my local supermarket and bought a NEW USB cable to the virus.. NOW it works.. for how long? Time will tell... If you haven't tried this it might be the cheapest option.. go buy a new USB cable and try it.
/Phillip J