The FCA will be releasing a consultation paper later this year to discuss potential remedies of intervention.
Karen Noye, mortgage expert at Quilter, said: "It is a great time to remortgage at the moment, with so many good deals on offer.
"We remain in an era of incredibly low-interest borrowing and if you don’t shop around you could be missing out on the best deals available.
"Many people have taken advantage of the low interest rate environment to lock-in to a favourable rate of interest in order to give themselves a sense of certainty and security.
"A willingness to search out a better deal keeps mortgage lenders honest and ensures a healthy, competitive market.
"Interestingly, there isn’t a huge gap in the household earnings of ‘switchers’ compared to ‘non-switchers’.
"This implies that the problem is common across households up and down the country within different earnings levels, and isn’t isolated to high earning households that don’t see the value in getting a better deal.
"Sadly, a lack of shopping around and switching is a familiar theme.
"In other financial markets, most notably in the retirement market, evidence shows that consumers often struggle to shop around for the best deal.
"This caused major problems in the annuity market, and continues to be a challenge in the drawdown market, where non-advised customers often stick with their incumbent pension provider instead of switching.
"Similarly, there has been a lot of work done to encourage bank account switching over fears that consumers were not getting the best deal for them.
"In the case of a mortgage, it is the biggest single expense for millions of households and getting the best rate available by shopping around at the end of your term is crucial."