When it goes into auto pause, it cannot find enough satellites to make the speed calculation. That happens to me on occasion when climbing in the mountains. Your 600 VAM from STRAVA is pretty good. I did a poll last year that allowed people to post their climbing ability based upon FPH (Feet per Hour) versus VAM (Meters per Hour). Most everyone was below 1500 feet per hour with the majority below 1000 feet per hour with many not knowing what their climb rate is. Here is a calculator to calculate your W/Kg based upon the slope of the grade and your VAM.
http://www.cyclingfitness.net/online-vam-calculator/
An observation... IMO, your cadence seems too low on the climbs unless you were doing low cadence intervals. I suggest not going any lower than 70 rpm with 75 to 80 being more desirable.