There may be an underlying fault, but a stubborn blockage which was not completely cleared can cause rapid recurrent blockages. If you are in doubt, you can have a CCTV survey of the drain carried out once it has been cleaned.
Specialist contractors can do this for you. Such a survey will identify any cracks, breaks, holes, collapses, root ingress, or other fault, it will also enable the accurate location of the problem so that repairs may be targeted if the drain needs to be dug up.
If you decide to employ a specialist contractor make sure that you receive a video and written report of the survey to keep. If the fault is attributed to "accidental damage" then the investigation and repairs could be covered by your household insurance. In all cases, contact your insurers for clarification first.
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