Any way to recover a Feature Layer with "undefined" error?

[wilcow]

I have a Feature layer created from Survey123 Connect that started returning this "undefined" error this AM.

We noticed it when field staff reported being unable to submit surveys via S123 Mobile App and when I investigated, I saw the error on attempting to open the FL overview page.

This happened last week and I was able to repair by clicking Rebuild Spatial Indexes in FL Settings page, but now I don't even get the option to open Settings (the Settings button is greyed out on FL Overview - see picture below)

Has anyone else come across this and is there a way to correct it? Not thrilled about the idea of losing all the data we've been collecting ...

[wilcow]

UPDATE: this morning, field staff report that they were able to submit saved surveys from yesterday. 

I'm able to access the FL in AGO with no sign if the "! undefined" error and I can access the survey in S123.

So far no data has been lost, but I'm initiating an off -site backup procedure. If this issue persists I may need to find a new solution

[RaenaBallantyne_DeMaris]

I hope ESRI takes a look at this; there seem to several of this error, especially recently:

Re: Getting "undefined." error message but nothing... - Esri Community

Re: "Undefined" an inaccessible hosted feature lay... - Esri Community

Undefined in AGOL . What is the cause for this ? - Esri Community

[wilcow]

@RaenaBallantyne_DeMaris  did you put in a Support ticket for your issue? Esri can't investigate if they don't know about it.

I had intended to start a ticket for my issue today, but as I stated it went away and I know from experience you don't get much traction with "this thing happened this one time and then stopped".

We may be able to get a ticket started and just have it open in case my issue comes back.