According to website, isra.cloud has Free(Registered) and Premium account
JDownloader will not use multiple proxies for Accounts. Only free (no account) downloads may use multiple proxies at the same time. Accounts will only use the same one proxy to avoid issues (for example Account blocks) because of multiple IPs using the same account.
Isra.clound plugin doesn't have any 24 hours countdown?! JDowloader detects that the traffic limit is reached and then temp disable the account until traffic is available again (checked regularly)
The switch from premium to free should not happen. Please provide logins and some example links to
support@jdownloader.org and I can review the plugin