Push notifications not working with Pera wallet

Hi there,
exploiting the integration between WalletConnect, Pera Wallet and JSON-RPC i have implemented a NodeJS backend that sends transactions to be signed to Pera Wallet (Algorand). I have encountered a problem with the transaction signature request notifications. If the app is open, I receive correctly a push notification for the transaction signature reques, while if I put the app in the background or close the Pera Wallet app, the signature request notification doesn’t land on the smartphone until I open the Pera Wallet app.
How do I solve this problem?