I have a forerunner 245 about 10 months old - it has worked perfectly until this week where on 3 runs now I have started the run and the timer starts but it does not register distance or pace. The distance may then start up sometime into the run - today after about 50 minutes and then records more slowly then actual (I was running with someone else whose watch was functioning so could compare) - so today's 15km only registered as 6km. This has happened three times now.