PingMulti- DS sometimes starts failing

Hello,

We've been noticing a weird issue ultimately with the 'PingMulti-' data source. Some instances stop working from time to time, however, by disabling/enabling them they start to respond again.
This is concerning b/c we've thousands of Ping instances (for our clients) & it doesn't seem to represent a 'REAL' issue.

Does anyone faced this in the past?

Thank you!