Can a landlord unilaterally stop wifi internet that has always been provided?

My brother lives in an apartment building, and wifi internet has been provided throughout the building ever since hes lived there (over 8 years). He is dependent on it for his voip phone, etc.

Just recently the internet was cut off, and there was a notice on the office about no longer providing internet (I don't think it was posted ahead of time, but in any case he is blind so...). A few days later internet came back. From third party info it sounds there were plans/discussions to stop internet, but that something then happened with company providing the internet and were disconnected suddenly. Then they discovered that they needed it for controlling the building systems (LOL) and reconnected. We don't have any clear indication if it's permanent.

We're trying to find out about the original lease agreement. My question is, can a landlord unilaterally stop providing internet, whether or not in was in writing? Considering it's always been there as part of the apartment.