Landlord breaking lease for no reason
I just renewed a 6 month lease on my house. The property manager called 3 days later and tells us that the owner wants to make some changes and raise the rent. They will not tell us why. I asked for this in writing, they never sent it and called today with a threatening phone call saying they were going to break my lease and we would have to move out. I asked what reason they were going to break the lease and they said that "they would pick something". They said they would be coming to inspect in 2 days. We have had not issues until now, the property is maintained very well by myself. Can they raise the rent for no reason, and what reasons can the propery manager break the lease?