ATM Withdrawals in China

I currently have a Taiwan Post Office account, and whenever I travel to China, if I try to withdraw more than 100k in a month, the card states that I have reached the limit for withdrawals for the month. The local Post Office tell me that there is no problem with the card and that this should not happen, and so neither the Post Office nor myself know why this is happening.

So I have decided to look for another bank that will allow me to withdraw however much I wish from my account, within daily limits of course, from ATMs on the mainland. Can anyone who travels to the mainland and uses an ATM to withdraw their money recommend a bank that will allow this and not have the ATM card freak out whenever the 100k limit is reached. This is for legit business purposes and every should work just fine, but it doesn’t.

I would appreciate any advice anyone could give me.