Accuracy not increasing with BERT Large model

1

I used both BERT_base_cased and BERT_large_Cased model for multi class text classification. With BERT_base_cased, I got satisfactory results. When I tried with BERT_large_cased model, the accuracy is same for all the epochs

bert-error1
bert-error1926×636 34.9 KB

bert-error2
bert-error2925×636 36 KB

With BERT_base_cased , there is no such problem. But with BERT_large_cased , why accuracy is same in all the epochs? Any help is really appreciated…