You are likely to annoy many of your customers even further. Including the word 'may' shifts the sentence from apologising for causing actual inconvenience, to

You are likely to annoy many of your customers even further. Including the word 'may' shifts the sentence from apologising for causing actual inconvenience, to apologising for causing a minor risk of possible inconvenience, which is not what you are trying to convey after selling someone something for a lot of money and then remotely breaking it at no notice. In many customers, it is likely to elicit a response something along the lines of: "Any inconvenience this may be causing? I'll give them may be causing. The fucking thing won't boot. May be fucking causing. I wasn't using the damn thing as a doorstop."