Currently known to impact all supported releases of CA Performance Management
When a device has its Collection membership changed, Polling Configurations are broken and not rebuilt.
New code has been implemented to ensure that Polling Configurations are maintained, or rebuilt, as needed during Collection membership changes.
This is resolved in the available r3.5 and r3.6.1 July Monthly Update Kits. The problem noted in the Fixed Issues lists for each release is:
Symptom: The polling of some metric families can be stopped randomly on some devices.
Resolution: Improved the polling configuration code to better handle the process of moving devices from/into collections so that the polling of device metric family will not be stopped.
(<release>_July_Update, DE367701, 01128609,01106101,01083812,01078242,01133094,01149492,01084932)
This problem will also be resolved in the RTM r3.7 release.