I seem to be having some problems with my GPS. sometimes it takes an age to aquire satellites while my friends quad (an F330) finds them really quickly. He has an external GPS antenna (DJI) which usually finds a good 9-10 satellites within minutes. Mine rarely finds more than 7 and sometimes has trouble finding any at all, even in open spaces. Anyone has similar issues and managed to find a way to improve? Thanks for any help.