WooCommerce – Internal server error

Hi we have an issue with our woocommerce site. Its been working fine up to one week ago

Initially the problem was when someone places an order with a credit card, instead of a thank you page they were getting an error that says “an error occurred please try again or try an alternative form of payment” BUT the order did successfully go through. However, because the customer thinks the order failed the customer keeps trying to place another order and another order, etc.

We have checked with the credit card processor Payeezy the cc gateway and they said its the woocommerce site throwing these errors – they guaranteed it was not them – everything is processing correctly through them.

So there were two plugins that needed updating – so we did the updates (everything is now up to date) and now we did another test order yesterday we received an “Internal Server Error” instead of the payment error mentioned above – but AGAIN – the order did go through.