In this article, Adspert provides more context to the notification of "product-lost-volume". This notification triggers when your product(s) haven't received any impressions.
The notification description
Description: Product lost volume. A number of products haven't received any impressions in the last 2 days. We recommend reviewing the advertising account settings and making the necessary adjustments.
Conditions to trigger
This notification trigger when your product didn't receive any impressions, there could be several reasons why this is happening.
Not in the buy box
Out of stock
Not eligible for advertising
Outstanding payments to the advertising platform
Do not fulfil the advertising guidance
Feed management does not comply with the advertising platform (e.g. wrong pictures)
Suggestion
When this triggers, we suggest that you have a look at the product(s) and see if there might be issues with your settings and or products that could explain this.