When seeking help it's always a good idea to report your Roku model, model number, and Roku software version as shown via Settings > System > About. Different models have different features and capabilities, and some things depend on the Roku version you are running. If we have this information to start with, you can get targeted suggestions more quickly.
In your case what exactly does "difficulty reconnecting" mean? Trying to connect to wifi or to direct wired Ethernet? Is this a change of internet provider? Same or different router equipment? Any sort of error messages shown?
The more you can tell us about exactly what you are doing and what you are seeing on your screen the better people will be able to help.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X