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UC1846: Issue with Sync Pin

Part Number: UC1846

Hi,

I have a design in which two UC1846 ICs are operated in Master/slave mode with SYNC connected directly. Normal operation of the ICs is as shown below

However, under certain conditions, the oscillator of the master IC gets distorted along with the sync, creating further issues in the converter.

Is there any advice regarding this issue. Something similar happened in a different circuit, posted here. Is this a similar issue with the oscillator 

The design under study are two multi-output flyback converters one operated with primary side feedback and the other with secondary side feedback