Flight mode: unknown error

PX4 Autopilot Configuration & Flight Modes ⚙️
1

hardware: PIXHAWK MINI
firmware: PX4
QGC: v3.1.3

I sometimes get the error message below when I connected pixhawk to QGC with USB cable.
When this message is shown, “Flight Mode 6” becomes “Unknown: n”.
This error is not always; almost at 1/2 chance when I connect them.
When the message is not shown, I can see the value of “Flight Mode 6” properly.
I reinstalled firmware a few times but this phenomenon has not been resolved.
Does anybody know the reason of this error?

In addition to it, when I connect the battery to my vehicle to fly. I always need to reconnect the battery. Because at first connecting, LED of I/O B/E keeps blinking yellow and rejects arming, and at second connecting just after the first connecting, I/O B/E will stop blinking and I will be able to arm.
I do not know if these problems have connection with, would you please help me with this error too?

フライトモード6がUnknownになる.jpg1920×1030 111 KB

フライトモード6がUnknownになる2.jpg1920×1030 134 KB

2

Which version of PX4 is this? Does it only happen with USB power?

3

Hi dogar, thanks for your comment.

PX4 version is 1.5.5.
I don’t know if it only happens with USB power, because I haven’t succeeded to connect QGC wirelessly.

This problem seems to have been resolved by replacing GPS module, although I don’t know how they relate. My GPS module had hardware error and 3DR gave me a replacement. After replacing GPS module, this error stopped.