The phrase "additional problems that" is correct and usable in written English.
You can use it when introducing further issues or complications related to a topic being discussed.
Example: "The report highlighted several additional problems that need to be addressed before the project can proceed."
Alternatives: "further issues that" or "more challenges that".
Inspectors then found additional problems "that really tripped off a more comprehensive review," he said.
Athens also presents additional problems that could come into play in even a minor attack or a scare.
William A. Mundell, chairman of the Arizona Corporation Commission, the state's regulatory panel, said he was sensitive to concerns about the effects of pollution and any additional problems that each succeeding plant might cause.
"The division of responsibility between national supervisors and the E.C.B. also creates possibilities for additional problems that may inevitably arise in the gaps between the two, as such a division and the necessary coordination can never be perfect," said Sony Kapoor, the director of Re-Define, a Brussels-based research organization.
Uncertainties and noise are additional problems that arise in heterogeneous, cross-organisational cloud architectures.
It comes too close to the discussion by the Fed regarding their understanding of the current housing problem and the additional problems that lie ahead.
RIM's variety of BlackBerry models present it with an additional problem that could also make a comeback less likely.
"It has the additional problem that – as a prison primarily used to hold inmates on remand and on short sentences – its high turnover makes for a naturally unstable and volatile environment, not helped by the easy availability of, and roaring trade in, drugs".
This approach faces the additional problem that, as the techniques of clinical medicine become safer and less invasive, increasing numbers of procedures used in non-beneficial research would be deemed excessively risky.
An additional problem that should not be underestimated is that during the deterioration process volatile organic compounds (VOCs) are often emitted from the surface of the object as it degrades.
Nevertheless, the exposed hardware implies an additional problem that is often approached by replacing the internal hardware with external fixators [3] and soft tissue reconstruction in a second surgical period.
