I am sharing a question on Enphase Community

https://community.enphase.com/s/question/0D53m00007P62ncCAB/grid-instability-issue-anyone-have-similar-issue-

It is a known issue, but, No one answer it. 

It is a FW of Inverter or Inverter's Problem, 

Due to this issue, can lost 2-4% Pure Production in System, 

Because eqch drop will affect 1.5% lost. 

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I have bought Paid Manager service to check in detail, 

I just find any advice or idea who have experienced it before

This is 7d graph, you can see the green spike, that is the point of issue, 

I have checked in detail 

Before the trouble, everything looks no issue, 

BUT, if check DC current, there is an different story

DC current is not 0A, it is 0.59A with 40.34V DC voltage. 

micro inverter is not just shut-down, it is eating DC current, and temperature is going up

it is the temperature spike which has shown 7d graph. 

First issue has started on Aug 17, and it become more and frequently, 

Second issued inverter has started on Sep 2, and it become more and frequently. 

3 inverters are twice a day, and 2 inverters are once per 2-3 days. 

not sure, it will get worse or not. 

Any idea or advice about it ? 

ADD/EDIT: 

This issue has started on AUG/SEP 2021

and, getting worse - more frequently, 

Finally, it start to shutdown 3 times per inverter 

ADD/EDIT : Bad news, It is affect on actual production

If see the green line, can see a power down at noon (it is average of 3 zone, 4-6 inverters are showing issue at only one zone even installed all at same time)

three inverters are showing error at similar time around noon. 

it is power level using Production Meter Reading at Envoy every minute. 

yes, production rate is slowing down little bit at noon, 

It means, It is real Shut-down & No Production. 

ADD/EDIT : Is it really grid instability ? 

I am running my system using AC Coupling Mode, GRID voltage is 237V (20V lower than actual 

grid voltage), and much stable. i have add RP230-30-10 filter, and 5 ferrite ring on L1/2 to filter 

noise. The issue has not been improved at all, not worst or better, same.

i have 3 groups, the first string is, Group1-Group2-Junction-Envoy // 2nd string is Group3 - Junction - Envoy. No issue on 2nd string at all. Most of Group 1 show an issue, 1 out of 5 at group 2 shows an issue, 2-3 times per week.