Stock shortages for the Nintendo Switch have been reported in certain markets. The issue, however, seems to be more prevalent in the United Kingdom.

A retail manager in the U.K. has complained about Nintendo's vagueness about the matter. The manager said that they are "in communications" with Nintendo but a confirmed date for refills hasn't been revealed yet.

The retailer is especially worried over the upcoming April release of "Mario Kart 8 Deluxe," which is expected to attract more gamers to buy the Nintendo Switch, MCV reported. U.K. stores have seen both short supplies for the console's gray and red-and-blue edition.

Due to the dwindling stocks of the Nintendo Switch, some users have been forced to buy from online scalpers who double or triple the console's price. Nintendo retails the gaming system starting at $299.99, but scalpers sell it for $400 or beyond.

Stocks became available on 365games.co.uk for both versions of the Nintendo Switch, but that quickly disappeared when buyers became aware of it. The online retailer sells the console for £329.99 ($403), which adds £50 to the original price.

The same thing can be said for Nintendo, John Lewis and Tesco; the new stocks rapidly sold out in just a matter of minutes. Check out the latest online stock for the console on Stock Informer.

The Nintendo Switch may be hugely popular right now, but users have been complaining about problems in the gaming system. Frame rates drop while playing games is one of those issues, and the root of the anomaly has been identified recently.

The dropping frame rate was reportedly caused by how the console searches for a Wi-Fi signal, according to Game Rant. The Nintendo Switch has a Wi-Fi auto-connection process and it completes its scan for signals intermittently. Locating Wi-Fi signals are carried out in the background, but it seems to be affecting gameplay in a bigger way.

Users are advised to disable the Wi-Fi Auto Connect option in the console's System Settings or turn on Flight Mode. The frame rate drop vanishes when this was done.

Bear in mind, however, that Flight Mode won't be activated when the Nintendo Switch is docked. Eagle-eyed gamers also found a design flaw in the console's firmware that results to slight drains on its GPU resources.

"Mario Kart 8 Deluxe" will run at 60fps in 1080p when docked on the console. That resolution will remain even in split-screen with two players, but will drop to 30fps in 1080p when three or four players are involved.