So, finally, I’ve found that small issue. Samsung S22 Ultra has an excellent Battery optimization feature in order to save the battery usage and by default, it tends to restrict the battery usage. AntennaPod was actually being affected of this. See the following screenshot:
Red Box: Restrict Battery Usage
is the default option, due to which if AntennaPOD is put behind other apps while playing a podcast, it would stop/pause playing its media.
Green Box: Optimize based usage …
Currently, this is the right selected solution. I’m enjoying AntennaPOD now 
Thank you again for developing such a wonderful app… Appreciating and enjoying…
Best Regards..