I've put in a support ticket about this problem were currently trying to figure it out. So far what they had me do hasn't worked. If anyone else had had this issue and fixed it please let me know because this Snap mode for knob movements is essential for me for live performance.
I noticed out of nowhere that my Access Virus TI2 knobs functionality isn't working as it should be in Snap mode. Instead, it seems to think it's in Jump mode because that's what it is doing its keeps jumping when the knobs are moved after switching between parts. I don't understand why this is happening, I've been working with it in Snap mode for a long time, and suddenly now when I switch between parts back and forth the knob I adjust jumps like it shouldn't. Keep in mind that I use my virus in multimode and the sounds I am testing this out on are all sounds that have been saved to my RAM slots, and im moving between different part numbers using the Part selection buttons.
I'm currently running OS 5.1.7 and I was told by support that there was no known issues with Snap mode in OS version 5.1.7
An attempt to fix this problem was made after support suggested resetting the unit. (not to factory) but Instead resetting the (Global settings). Resetting the unit was done by the following "Reset the unit by holding down the Arp section "EDIT" button for a few seconds while the unit is in standby mode. Whenever this is done and the TI have booted up" This process solely resets the global settings of the unit.
After completing this process, I tested the unit by making sure Snap mode was selected, and still noticed that the knob movement seem to be jumping. I'm testing this by adjusting the cutoff 1 knob between Parts 11 and 12. I adjusted the cutoff 1 knobs for both parts to 0 to start. I then selected part 12 and raised cutoff 1 to 50 then switched back to part 11 and as soon as knob motion was received it jumped to 50. If I go back and forth with them from 50 to 0 its the same results. The sounds on these parts were previously saved patches the RAM drives. I do want to mention a few times during my testing I think that Snap worked but it was random I was trying to wait a few seconds after switching parts for it to maybe load fully like that may have been something, 3 seconds but it didn't always snap then for me. So it's not a matter of waiting for the patch to load. I never remember having any issues like this. I always had snap mode selected with no problems.
I was told to test the unit completely removed from any other Midi devices. Support was thinking a possible Midi loop could be causing it. This was not the case, I tested it using 3 different midi sequencers, Social Entropy Engine, Elektron Digitakt and the Elektron Octatrack separately. Each time I only had the Midi IN of the virus plugged into the Midi OUT of the sequencer. No other midi cables were plugged into either of the machines during testing. Unfortunately, I'm still getting the same result. Snap mode is essentially operating as if it's in Jump mode. Release mode was tried with the same result its behaving like Jump mode. Turning input to off works as expected. I also tested using two different midi cables for the sake of it. I've been using this virus for well over a year now and suddenly I noticed my knob movements were no longer snapping. It was very obvious and I'm very confused. Pretty much makes it useless to me for live PA.
This issue is not related to the Soft knobs and Snap mode. Its different. I read the posts on that already.
If anyone can please help, this issue has pretty much stopped me dead in my tracks as far as progressing musically as I was intending. 
Thanks so much for reading through!