Well I am not an expert on this if given it was a free version I would have said maybe you exhausted your daily quota for GPU but given the fact you are on a pro version I am not sure of if that would be the reason, from the screenshot it looks the model is still training?
One thing you can do is to check the number of active sessions and kill the sessions which are not needed. In the free version you can use two sessions simultaneously. Hope it helps.