Funnily enough, I had a very similar issue yesterday too. I'm also using Tinker-MarlinUltimaker2-16.12.1 and have the 3d Solex upgrades you do too, but not the Bondtech feeder.
My printer's been happily printing all week, some long jobs, some small. Then, on a print yesterday, decided to stop about 1.6mm into a print for no apparent reason - exactly the same as you, print head stopped at a single position, filament oozing out into a blob where the print head was. The only difference was that my display simply said: -
"ERROR - STOPPED" followed by "Go to ultimaker.com/support".
I power cycled the printer, restarted the print from scratch, and it ran perfectly for the 4hr print time. I've had the same thing happen just after Christmas, but never before - both errors occurred on the latest Tinker firmware (I upgraded as I was getting the printing outside of area errors on the previous Tinker firmware).