IDEA: Look internally when your bank becomes difficult: most likely the problem stems from your non-performance.

Profitable companies pay less:    The more money that your company makes, the more friendly your bank will become (lower interest rates, lower or no fees, higher lines of credit, more opportunities for nothing down loans and financing, lower bank fees, better loan rates, more easy to negotiate, fewer personal guarantees or other binders and restrictions).

Unprofitable companies pay more:   When you begin losing money, bank officials impose restrictive covenants which cause fines or penalties imposed by the bank.  You stand a far better chance finding another bank when you are making money than when you are not. Tell yourself bluntly the uncomfortable problems you are having with your bank generally stem from your inability to make the amount of money your financial agreement promised. You failed, not the bank.

Focus on your profitability:   Instead of focusing your anger on the bank, focus on your failure to run your business and make a profit. You are more than welcome to look for funding options, but finance companies/banks/ABLs (asset based loans) want customers that are profitable.  Fees have an inverse relationship to your profits:   losing money, high fees,  earning regular profits, low fees.  It is simple. Look for banks when you are making money or stay put and renegotiate your rates and increase your maximum LOC amount.