Hi Ankit,
Regarding this issue, firstly, make sure your SFB server with the latest update. Secondly, please ensure persistent chat Server hardware meet the requirement in the link below:
https://technet.microsoft.com/en-us/library/dn951388.aspx
https://technet.microsoft.com/en-us/library/gg398495.aspx
Here is a document about SFB Persistent Chat ChannelService.exe high CPU, please refer to
https://tsoorad.blogspot.sg/2017/02/sfb-persistent-chat-channelserviceexe.html
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Hope this reply is helpful to you.
Regards,
Alice Wang
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