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If you have a full packet capture you can select a RST packet and do follow TCP stream. Then you can tell more.
If it follows FIN packets then this is not something you will notice as user as it happens after the connection is ended. It may point to tming issues where a FIN from the other party is late and your end consideres it close. (Which strictly speaking is incorrect behaviour on your client.)
If it happens mid session then something else is wrong but in that case someone needs to look at that packet capture and dive into what is hapening.
The flowchart and tekst on https://stackoverflow.com/questions/30043126/what-is-a-finack-message-in-tcp might help you understand the various states and determine if the cause of the RST packets.
It could be you router doing "it's thing" securitywise.
