SOURCE: data lost
Sounds like the memory battery ran low. Did you get a "Memory battery low" warning message when you switched it on? If so then that confirms it, and I'm afraid your waypoints are lost.
As for the memory battery it will take on some charge if you just put in fresh AA batteries. How much charge depends on the age of the GPS, mine is over 10 years old and the memory cell is pretty much dead now.
Grmin may or may not replace the cell for you depeniding on the age of the device. If you want to do it yourself it's a very fidldy job requiring some expertise with a fine pointied solderign iron. The case is held together with solicone sealant aroung the joining edges - there are no plastic catches - one piece of the case has a sort of trough around the edge that the other piece/side slots into and the trough was fileld with silicone sealant and the two pieces sandwiched together. It's not a very strong glue though so it can be prised apart with a fine knife and patience.
Follow this link for information on way-point restoration.
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