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Garmin seems to "forget" personal records

Have been using the Garmin Forerunner 945 for some months now and overall very happy with it. There is just one thing that bothers me and that is Personal Records.

About two months ago I ran a 3.53 kilometre in a 10k race. The watch correctly stated that this was now the fastest K I had run with it. A new personal record, yay. However, two weeks later, after another run, I got the message that I again had run my fastest K (and mile), at 4.22 this time. Today again, now my fastest K is 4.31 and again I had a (slower) faster mile. Basically the watch seems to forget old data. 

Is there some setting in the watch I should change?

Anyone else experiencing this problem?

Under Profile in Garmin Connect, my personal records for the 5 and 10 K are stated and they ARE correct, which makes it even more strange for me.

Thanks in advance, have a nice Sunday :-)