PIXhawk4 problem after problem

Hello and good day… I find this Pixhawk 4 is very unstable and problem after problem …motor speed unstable speed …gps error …setup error …I been building drone full time now for 3 years …fc that i had used dji naza M dji naza v 2 Betaflight fc no problems that i i had face with it…this is my first for 2 unit pixhawk 4 and pixhawk 4 mini both are with endless problem really rubbish hardware and software !!!..the support is another rubbish …dji and betaflight will respond within 24hrs really good pixhawk need to learn from them !!!