Chances are the Xbox 360 is falling victim to the fact that it has been unsupported for nearly a year. As can be seen here as of October 2017 it is unsupported and will not receive any future updates.
You are going to be seeing issues crop up as PMS moves forward and the Xbox 360 client can’t. Really your only options are to revert back until you find a version that will play for you or upgrade to a supported client.
