Ration your energy, use it only on important things (and knowing what is important is the hardest part) but be ready to give
all of your energy to the company for the foreseeable future.
Customers will be
impressed when you hop on a plane at a few hours notice to fix their disaster and
this will build loyalty and a sense of teamwork with them.
If the problem is not your fault make sure you bill
them. If it is, make sure you apologize and make it up to them. They bought the product from a startup knowing that there might be problems but also trusting you to fix them.
Either way you
will build a healthy business relationship and a reference for how well you
react when things go sour.
