I have also used IDFC 25K variant account for 1 plus year. Never faced any issue. Closed it when I opened Indus Exclusive.
As per my knowledge normally an account is frozen on below conditions and this is a common rule for all banks:
- Debit freeze - when KYC/ReKYC is due
- Account freeze - no customer initiated transaction for 2 years (interest credit, charges debit, etc. are not counted as customer initiated transaction)
There will definitely be other legal/security reasons for freezing accounts.