Timer lags in Xamarin android

We were developing a cross-platform app for iOS and Android which uses a timer (so we are using the Device.StartTimer Thread).
While testing our app against the google stopwatch, the iOS version of the app lines up perfectly (in a timespan of 150000 milliseconds), but the Android app falls 10000 milliseconds behind by the end of the 150000 milliseconds.
I have tried disabling the Mono Runtime, but the app still shows this behavior.
I would appreciate any help on this!