Error or broken zip file while downloading submissions using Central

1. What is the problem? Be very detailed.

I have hosted Central on DigitalOcean droplet. The application was running perfectly fine till 2 days back until I scheduled the google drive backup.
I'm unable to download the images or zip file containing responses from Central. However, Briefcase is able to download few parts but with errors of bad gateway.

2. What app or server are you using and on what device and operating system? Include version numbers.

Digital Ocean Droplet with Docker as per ODK instructions

3. What you have you tried to fix the problem?

I have tried:
cd central
docker exec -it service sh
cd /tmp
rm -rf tmp*
docker-compose stop
docker-compose up -d

4. What steps can we take to reproduce the problem?

Please refer screenshot attached.

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

Please refer screenshot attached.

Issue Resolved. Upgraded the CPU and RAM of Cloud Server.