My old VQC 15 has some problems with Y axis.

I threw this alarm today "50 Y FEEDBACK ALARM"

I ran a program that was proved and i just did 5 parts previously.

I got some problems sometime with a EXCESS SERVO LAG alarm on the Y axis aswell.

The Servo drive had "47" on the field with text.

Anyone have any idea about what can be the problem? there is no info in the manual.