Push notification sent but not received

Hello everyone, we are having problems with a server application made in Java, which had been working without problems for two years, this Friday we started receiving calls from our clients because notifications of their bank movements are not showing on their device mobile application. We also note that after several attempts Apple is closing our connection, we are already looking everywhere for documentation about our problem but nowhere is a solution shown.


Building Raw message from deviceToken and payload

Built raw message ID 5 of total length 256

Attempting to send notification: {"aps":{"badge":1,"idPush":"2020-06-15-13.42.02.755423","alert":"15/06/2020 14:28:50 Mensaje 5 de 5 .Mensaje de prueba desde las oficinas de Intteinolo/SmartICM","category":"notif.category","mutable-content":1}}

to device: f6b9b55fddfbf2c0343a72179b81da91e26d640fc8f47066e40ac2e48cf6f141

Flushing

At this point, the entire 256-bytes message has been streamed out successfully through the SSL connection

Notification sent on first attempt

f6b9b55fddfbf2c0343a72179b81da91e26d640fc8f47066e40ac2e48cf6f141 --> Message Sent


Buy message is not being received...