Mouse issue

[Snozzz]

if its interference from other equipment you should be able to find a time when it works ok as the people using those will stop at some point ie when they sleep.
but firstly you need to start using the recomended Alkaline batteries
this is because the rechargables you are using will have a lower terminal voltage than the Alkaline types (1.25V vs 1.5V)
so your mouse will behave like the battery is run out