After you file

Thanks @Mefloho . This is my story exactly. I resubmitted a paper copy of my 2015 return after it was flagged in the IRS system. I was instructed to wait 30 days after I mailed it in to check back in and on day 30........ The IRS shut down. :(  No 2019 return and now no stimulus payment update.  Must be a glitch.