To ensure a stable behavior on a Raspberry Pi it is recommended to set a swapfile with 2048 MB to buffer memory usage peaks. Running out of RAM without having a swapfile in place will crash the Wallet and could corrupt your copy of the Blockchain.
To create a swapfile on your Raspberry Pi you can use the following commands:
Make sure to back-up your wallet first: How-to
Close the Wallet completely
sudo su -c 'echo "CONF_SWAPSIZE=2048" > /etc/dphys-swapfile'
sudo dphys-swapfile setup
After creating the swapfile, you have to activate it once by using this command:
3) sudo dphys-swapfile swapon
Now your Raspberry PI has enough SWAP in place if its needed, and will not go down because of RAM overload.