There are several factors that may cause the app to stop working. In situations like these, you should always have a Backup of your wallet.
Here are some things you can do to try and fix this issue:
Step 1: Restart your Device
This is the most overlooked step. A simple restart or turning the device off and on can clear any issues with the phone or with the app itself.
Step 2: Checking your Connection
As always, in order for the app to work, you need to be online. Try opening a Browser or opening another app that connects to the internet. Switch off/on your Mobile Data, try to reconnect to a different WiFi Hotspot. If there is a connection problem then you would need to check this further on either your device settings or Internet provider.
Step 3: VPN Usage
In some cases, your connection gets blocked when you are on a country that prevents accesing Crypto related sites or app. Some users also want additional privacy, using VPN is one way to add this layer of security. This can also affect the performance of the app, be wary of restrictions and abide by them.
Step 4: Update Your Device OS
Newer versions of Trust Wallet app requires that you also have the latest OS on your device. For iOS, you need at least iOS13 and higher. And for Android devices, Android OS 6.0 or higher is required.
Step 5: Install Latest App Version
Our devs are always adding new features and fixes to ensure the smooth operation of Trust Wallet. Always check for the most recent version available for your device.
Download Trust Wallet only from official sources.
Here are the download links for both platforms:
App Store: https://apps.apple.com/app/trust-ethereum-wallet/id1288339409
Google Play: https://play.google.com/store/apps/details?id=com.wallet.crypto.trustapp
You can also join the Beta Program to get the most recent version before it goes public. Sign up here: https://trustwallet.com/beta
Step 7: Test Another Device(Optional)
To better isolate the issue, using another device is another way of doing so. If you have a spare phone or tablet, install the app and test. The result of this test is beneficial for our devs, if it comes to a point that a ticket has to be submitted.
Step 8: Submit A Ticket
After going thru all the steps mentioned above and you are still unable to fix the issue, then the next step is to submit a ticket. You can do so by going here: https://support.trustwallet.com/hc/en-us/requests/new. Provide as much detail as possible to help us understand the issue easily.
Here are some sample questions that you can answer and include it on the ticket.
What is the issue you are having?
Be very specific on what is the problem you are experiencing. Is the app crashing or stops responding.
When did the problem occur?
Knowing when the issue started will help us narrow down any potential causes.
What was the last thing you did before the problem started?
Did you recently install something on your phone?, or accessed a certain website? This helps too.
What have you tried to fix the issue?
This is where the troubleshooting steps above come in.
Provide all details about your device.
App version, OS version, etc.