Be careful if you're thinking of installing the v3.10 firmware update.... Many people are reporting this on various forums - before the update I had never seen this ever. Immediately after the update I got this - IMU initialization failure, may be caused by crash. Please contact dealer or DJI for repair. I don't exactly know what I did but it suddenly stopped giving the error after leaving it a while (it may have been my umpteen calibrations or just time for it to think about what it had done to me - I don't know) So today I took it out for a flight and all was absolutely fine it behaved perfectly.... but then I brought it into land and powered down and then I thought I'd power it back up just to see if all was well.... but I got the dreaded red, green, yellow flashing which indicates Error 25 the IMU initialization failure. I thought that was the end of that but I waited just a few minutes and powered it on again and it was fine!!! So I've tried the flight, land, power down and power on a few times now and each time I power down and try to power up straight away I get the error flashes ... but if I wait a few minutes it powers up fine? Something definitely isn't right but when it's happy and does initialise and power up it flies absolutely fine? Thoughts?