Hi,
Mini batch accuracy should likely to increase with no. of epochs.
But for your case, there can be of multiple reasons behind this:
- Mini-batch size
- Learning rate
- cost function.
- Network Architechture
- Quality of data and lot more.
It would be better if you provide more information about the NN model you are using.
Moreover, You can also refer to this link : https://www.mathworks.com/matlabcentral/answers/484326-mini-batch-loss-and-accuracy-trends?s_tid=answers_rc1-2_p2_MLT
If your case is similar like that.
