I 'm working on a string quintet with Notion SLE /vienna ensemble pro (32 bit) and everyhting worked fine till I've got this stuked notes ;or should I say stuked tempo cause even the metronom is delaying the beat and after is rapidly trying to recover the lost time making from 16 -32

Can anynone help me with this ,maybe is not the first time or tech support knows something? In rest I can say that this version is very good in terms of work flow and everything is very easy to understand!!
Thank you very much