Check that thread, unfortunately it sounds like you’re experiencing the same problem but this is the first time I’ve heard of it showing up following an update so maybe there’s a clue in that.
Report it to Elektron through the trouble ticket submission system after logging in to your elektron.se website user account and confirming your info is up to date. The warranty should get you sorted and they may want to hear that this happened following the update.
If you have only had it for a very limited amount of time, you may get a quicker resolution going directly through the retailer you purchased the dtII from.