Scheduled trigger and webtrigger getting timeout

Hi All, We are calling scheduled trigger every hour and webtriggers in loop with delay of 3 seconds until all our historical data is ingested in jira app. To get all logs for debugging we are creating separate invocation context by calling webtrigger in loop with delay of 3 seconds after prev invocation of webtrigger.
But after few invocations our scheduled trigger and webtriggers are not getting invoked.
We went through platform limits where invocation limits are mentioned but we are not hitting max invocation limits.
We need to know why webtriggers and scheduled triggers are not invoking intermittently and what is the per minute or per hour limit for number of invocations.