Samsung’s issues with the original Snapdragon 810 may have forced Qualcomm to build a brand new processor just for the Galaxy S6.

Sources say the chipmaker is modifying the original design of its latest SoC to secure its place in what will almost certainly be Samsung’s best-selling smartphone to date — and quite possibly the most successful Android-powered device of 2015.

The original Snapdragon 810 — a 64-bit, octa-core chip — will power a whole host of high-end devices from various manufacturers this year, but according to a recent report from Bloomberg, it’s not quite good enough for the Galaxy S6.

Those familiar with Samsung’s plans have claimed that during testing, the South Korean company discovered that the Snapdragon 810 was prone to overheating inside its Galaxy S6 prototypes.

It was thought that Samsung might make the Galaxy S6 its first flagship smartphone to be powered solely by its own Exynos processors, but a new report from The Wall Street Journal reveals that Qualcomm is working with Samsung to develop a modified Snapdragon 810.

Not many smartphone makers would get such treatment, but as Samsung is one of the biggest, Qualcomm must protect its partnership. If its latest chip doesn’t make it into Samsung’s most important device of 2015, it could mean a huge financial loss.

It could also mean a Galaxy S6 that isn’t quite as good as it could have been. Qualcomm’s chips deliver superior 4G LTE connectivity over Samsung’s Exynos offerings, so those in established 4G markets may well have suffered without a Snapdragon chip.

I don’t know about you, but I couldn’t be more excited for the Galaxy S6. I haven’t been a major fan of Samsung smartphones in recent years, but with promises of premium designs and the best specs on the market, it’s hard to leave it off your wish list.

• SourceThe Wall Street Journal