Hi @PrashanthKumar76, I'm so sorry to hear you're having an issue with your videos not getting played at full length. At the moment, this issue does not seem to be widespread, so I definitely recommend contacting our Instructor Support team with details about the lectures that are getting affected so the team can take a closer look. In the meantime, below are some resources to help you troubleshoot some possible reasons why this could be happening:
How to Troubleshoot Audio & Video Issues (on a Browser)
Troubleshooting Video Issues on The Mobile App
Bella Almeida
Udemy Community
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