I'm just starting with APM and this probably could well be my first post here. So, a heartily welcome :)
On to the issue....
Prior to the APM setup the copter was running a naza lite with no issues at all; eventually I got bored of it and decided to try something more exciting...
So I changed to the hkpilot mega 2.7 with telemetry radios, power module, gps and so forth.
Some additional info and current setup below:
reptile 500 frame
sunnysky 2216 900kv
dji 10x3.8 props and graupners 10x5 eprops
dji 30amp opto ESCs
ER9X on Turnigy 9X with DJT module and flashed D8Rii+ to D8RXP firmware 27ms with CPPM
1.2 fpv setup (not running currently unit I get the frame sorted)
Some background; I read a lot, troubleshooted several issues successfully and everything else well.
Went through the wizards, everything is calibrated, PIDs OK, throttle mid OK, barometer shielded, compass OK, GPS OK, no vibrations, latest firmware etc...
NOTE: my APM is mounted a bit forward and yawed 45 degrees (arrow right), params set for that.
THE PROBLEM I'm currently going through is that when Im flying the quad in stabilize mode (worried to change to anything else, other than POSHold for testing) and I give input in due time (like 40sec within the flight) the RC controls seem to mix up. For example in the first phase of the test hover/flight with roll/pitch inputs, the inputs fly the quad normally... In the second phase (after the 40sec), it seems that the roll input (right for example) mixes up with pitch...To visualize it better, imagine you ONLY roll right and the quad pitches and rolls diagonally backwards...Same thing happens with pitch forward only, roll left and so forth.....
In the beginning I thought this was a compass issue (not valid in stab mode) or an accelerometer issue...calibrated again and again...I've researched some other scenarios to no avail....
I'm currently swamped with this and I'm constantly hitting a wall ....
Any good ideas as to what might be the problem?
HELP people !!!!!!!
EDIT: I posted this below as well (wrongfully maybe, im not sure)