Problem with fetching pictures in Android apps - android

I have some apps on Google Store where I use images fetched from my server.
The apps were working fine, but a few days ago images stopped downloading to the app.
In the app, I download images using Picasso. Picasso's logcat shows a 504 error.
In addition, the following warnings appear in the logcat:
Accessing hidden method Lcom/android/org/conscrypt/ConscryptEngineSocket;->setUseSessionTickets(Z)V (greylist-max-q,core-platform-api, reflection, denied)
Accessing hidden method Lcom/android/org/conscrypt/OpenSSLSocketImpl;->setUseSessionTickets(Z)V (greylist-max-q,core-platform-api, reflection, denied)
Accessing hidden method Lcom/android/org/conscrypt/AbstractConscryptSocket;->setUseSessionTickets(Z)V (greylist-max-q, reflection, denied)
What happened that suddenly the images stopped being downloaded, since neither in the application nor on the server was anything changed?
How can I solve this problem?
I tried to update the libraries used in the project, but it didn't help

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