Fenix 8 HR/Steps not working

Since Friday night my Heart rate sensor hasn't been working, my Fenix 8 isn't recording any steps either. I have tried everything I have found online and after looking again today I have realised that BMX/WHR/Sensor Hub have all reverted back to 0.0.0/0.00.00/0.01, maybe during software update, I'm not too clued up on these things. Any ideas if I can resolve this as I haven't been able to contact Garmin yet due to BH weekend. Thanks