The phrase "are often due to" is correct and usable in written English.
It can be used to indicate that something frequently results from a particular cause or reason.
Example: "The delays in the project are often due to unforeseen circumstances."
Alternatives: "are frequently caused by" or "often result from".
Engineering failures are often due to human fallibility.
These repeat cases are often due to resistance to pesticide-based lice treatments and to improper combing and home cleaning.
I suggest that inaccuracies in scientific terminology and concepts are often due to promoters of new technologies.
Problems that come up are often due to a lack of clarity around that assignment's goals, schedules and/or deliverables.
Java virtual machine (JVM) crashes are often due to an invalid memory reference to the JVM heap.
"The symptoms themselves are often due to anxiety, such as chest pain," says Tyrer. "We get people to make the connection themselves.
Promotion has significant costs: players have pay rises written into their contracts and additional payments are often due to former clubs.
Subjective discomforts in a preclinical range are often due to imbalanced autonomic nervous system activity, which is a focus of craniosacral therapy.
Failures of orthopaedic procedures that use morselized cancellous bone (MCB) graft for load bearing are often due to gross displacement within the graft material.
What has emerged most recently from this latter group of studies is that diagnostic failures are often due to missed steps, so-called "process of care lapses," that stem from both doctors and patients.
They are often due to a culture that does not promote the systematic sharing of differing perspectives, instead supporting a hierarchy of power and one-way transmissions of information — both of which hinder effective communication.
