My Trackpad is loosing the connection

Hello,
my trackpad loses, during a session, often the connection and it shortly afterwards. I got this error since yesterday. What can this be? Can anyone offer a solution? I´m using an iMac mid 2011 with an Intel i7 3.4GHz with 16GB RAM.
Thank you very much in advance
Rudi

Very likely to be batteries.   Have you changed them recently; did you replace them with the usually recommended batteries like Apple (not my choice) Energiser, Duracell or Eneloop?   When you lose connection do you notice if the green light goes off.
When you check batteries, never forget to check the terminals inside the battery compartment; remove the batteries, clean them and the terminals with white vinegar or an alcohol based substance.   Wait for whatever you use to dry off then reconnect and (hopefully) away you go.

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