If you miss training calls, then your bonding percent will go down. Set the time to the following times to get the training calls. For me, it doesn't work on 2:00 and sometimes 4:00.
9:59 AM, 11:59 AM, 1:59 PM, 3:59 PM, and 5:59 PM.
Wait one minute for all the times and your tamas should call for training.