To make me able to accurately study the case, please describe in details and step by step, what exactly i.MX6SoloX hardware do you use (is it the i.MX6SX SABRE SD board or your own custom hardware?), what application software do you run on both A9 and M4 cores, how do you perform the test, what do you expect and what results do you actually get.
In general, the most likely cause of the issue is that the M4 core does not flush its rpmsg receive queue somehow.
Have a great day,
Artur
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