Check the antenna connection. Best thing I've done was to disconnect the battery for 20 mins or so. Reconnect and clean/ tighten antanna connection.
I'm almost positive it needs to be thirty minutes. You take the housing completely apart, disconnect the larger of the two white snap connecters then wait a full thirty minutes and put it all back together and charge it for a full 12 hours from what I was told and then it's a good idea to reset your handheld and add all collars back. They are in theory supposed to work like new again. After this.
Reset the handheld (220) by pushing enter map and power all at the same time i think.
