This is the first time I've started looking into the Loop time logs and maybe I'm interpreting the data incorrectly, but I'm seeing greatly increased NLon on 3.5-rc2. On RC1 my Mean NLon value was 71, with a max of 95.
On my last 2 flights with RC2, including the one where I filmed the successful AutoTune, my NLon Mean is 418, with Max of 468. I don't have any spikes and haven't had a crash, but definitely concerning to see the increase.
I'm running a Pixhawk 1 (clone, but seems to be working alright) and I believe I have all logging turned on, so that may account for the high NLon values.
PS, I manually installed the v2 version of the 3.5-rc2 firmware.