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8 changes: 8 additions & 0 deletions docs/symptom-survey/problems.md
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Expand Up @@ -17,6 +17,14 @@ interpretation of results. All problems will be logged here.
1. TOC
{:toc}

## Response Volume Drop (July 20-22, 2021)

On July 20, 2021, a technical problem in the process that samples Facebook users
for invitation to the survey caused lower-than-normal sample sizes. The problem
was resolved on July 22 and users that had been incorrectly not invited were
invited over the following several days. This caused sample sizes to temporarily
increase, compensating for the initial drop.

## Incorrect Coding in Documentation

We found a Qualtrics bug that affects the exported text of the survey (but not
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