Based on the newest Fsrussia' article it seems that Polina has some growing pains which has had an effect on their training.
I found the interview given by their coaches and especially what Ludmila Velikova said sounds alarming. I wondered if I really understood it so I used google translation:
Everyone goes through it, Polina is no exception. The only difference is that some are fighting, while others give themselves concessions. When an athlete does not fully understand what is happening to him, he does not find an explanation of why everything turned out in the past season, but is now more difficult to cope with, he often falls into a state of apathy. (...)
In our case, it all depends on how Polina spends the next month. If she draws the right conclusions, we will pull her out and help her. If not, then forcibly not make anyone happy.
I don't know what to think about her words, actually. Just hope Polina and Dima overcome all difficulties. I'll keep fingers crossed for them.