Bot not responding after a certain period.

[Magneto-noob]

2021-09-20T06:32:19.036771+00:00 app[web.1]:   self._do_submit_job(job, run_times)
2021-09-20T06:32:19.036772+00:00 app[web.1]: RuntimeWarning: Enable tracemalloc to get the object allocation traceback
2021-09-20T06:52:19.037670+00:00 app[web.1]: /app/.heroku/python/lib/python3.9/concurrent/futures/thread.py:79: RuntimeWarning: coroutine 'ping_server' was never awaited
2021-09-20T06:52:19.037680+00:00 app[web.1]:   del work_item
2021-09-20T06:52:19.037680+00:00 app[web.1]: RuntimeWarning: Enable tracemalloc to get the object allocation traceback
2021-09-20T06:54:39.180086+00:00 heroku[web.1]: Idling
2021-09-20T06:54:39.217727+00:00 heroku[web.1]: State changed from up to down
2021-09-20T06:54:39.870681+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2021-09-20T06:54:39.940416+00:00 app[web.1]: 2021-09-20 06:54:39,940 - root - INFO - Stop signal received (15). Exiting...
2021-09-20T06:54:40.923534+00:00 heroku[web.1]: Process exited with status 0

I have to Restart all dynos in order to make it work again. Please Fix..