pytrack: loses gps fix then crashes

[ozeta]

wipy2.0

os.uname()=

(sysname='WiPy', nodename='WiPy', release='1.7.5.b2', version='v1.8.6-694-g25826866 on 2017-06-29', machine='WiPy with E
SP32')

pytrack dfu ver: 0.0.3

1. loaded pytrack.py,L76GNSS.py and other classes from pycom github repo into /lib
2. created the attached code (inside zip archive):
   gpsNtpSaveTest_cpy.zip

after some seconds of getting cordinates into the while loop, l76.coordinates() starts alternating (None,None)
and the correct values.

after another some seconds the device rebooted by itself

[ozeta]

i'll post this in pycom-library as bucknall asked