OP2177 Silicon Change? Different behavior on newly purchased devices.

Hi.  In our application, the OP2177 output is disconnected for a period of time, and the feedback loop is broken resulting in the OP2177 output going to one rail or another (+ or - 15 V).  We then close the output relay and the feedback loop is closed again.  On previous part purchases (~2012 to ~2019), the OP2177 would quickly settle to the correct value.  The microcontroller would wait for a short period of time for the OP2177 output to settle and then continue.  On newly purchased parts, the OP2177 oscillates for ~100 ms before returning to normal operation.  I think we can work around this with a firmware change, but I just want to make sure that I'm understanding the problem correctly.  Thanks.