Reason for replacement of controller board

I would like to seek someone assistance to comment the following analysis.

The main electronic controller board of computer was found abnormal operation. It recorded the program installed in the board had been disappeared more than two times. It is therefore advised to replace the controller board to prevent any interruption of exchange service and secure the computer performance.

The mother board of the computer was found to have been operating abnormally. The error log file indicated that  the program installed on the board had been contaminated/ tampered / modified  or disappeared in more than two occasions.  It is therefore necessary to replace the mother board for the computer to return to normal performance and to prevent any program interruption.

. " ...To have been operating abnormally" is not passive voice but present perfect progressive.  It will take a real grammarian to explain the proper working of this tense. But I believe it’s correctly used.

But “was found to have been operating abnormally” is passive construct which  was the state the board prior to your discovering it. This part, yes, it's passive

2) >>>Is it correct if i use " in returning to normal performance" instead of " to return to?>>>

No, “to replace the mother board for the computer to return to normal performance” is correct. The sentence requires infinitive not participle form of the  verb “return”

The main electronic controller board of the computer was found to be operating abnormally. It recorded that the program installed on the board had disappeared more than two times. It is therefore advised that you replace the controller board to prevent any more exchange service interruption  and to secure the performance of the computer.