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Garmin forerunner 245 not synching with app or computer, no health or training stats displayed

My Garmin forerunner 245 has suddenly and rather frustratingly stopped synching with my phone garmin app or computer garmin connect
I no longer get my health or training stats 
I have gone through the similar problems and solutions listed on the forum
However none of them work
Like switching off the watch and blue tooth on phone
I have plugged it into computer, synch it with computer but still no sleep etc displayed
It says you have to wear your watch while sleeping
Which I do
I have installed the latest versions of all apps and software
I removed and reinstalled garmin app on phone
Nothing worked
Please can you let me know a solution?
and reason for this?
Do you have to buy new hardware after a certain number of years or something?
Thanks 
James