Why Bluetooth Is Still Unreliable
Dropped connections, stuttering audio, and the most annoying issue of all—attempting and failing to connect a new device a hundred times without success. For a technology approaching three decades old, Bluetooth can be a massive pain. While it has certainly improved over the years, it continues to be flaky and unreliable in many fairly common circumstances.
You could argue that much of that unreliability is not really Bluetooth’s fault. It is struggling to do a difficult job in an increasingly crowded environment. Controlled by the Bluetooth Special Interest Group (SIG), Bluetooth is constantly being crowded by other traffic and new technologies.
One of the main issues with Bluetooth comes down to interference. Bluetooth operates on the 2.4 GHz band, the same band crowded with traffic from Wi‑Fi, wireless devices with dedicated dongles, and even old polluters like microwaves. Frequency hopping—where a signal bounces around channels within the 2.4 GHz band—can help mitigate some problems. However, Bluetooth will always suffer from interference and packet loss.
Bluetooth: The Power Behind the Throne
The Bluetooth group is also responsible for the technology using short‑range, low‑power signals. This means that furniture, walls, and even human bodies can interfere with Bluetooth broadcasting. Device placement takes on outsize importance for signal strength and reliability.
Another issue is that, despite being one of Bluetooth’s most pervasive uses, it was not originally intended for audio. Bluetooth was originally meant for wireless data transfer and later modified to create wireless personal area networks (WPANs). However, it transfers data at slower speeds compared to other protocols like Wi‑Fi (600 Mbps for Wi‑Fi, barely 2 Mbps for Bluetooth 5). This means it is slow to self‑correct if data is lost, leading to audio stutters or disconnects.
Version control and backward compatibility are also problematic. If you connect a new phone with Bluetooth 6.0 to older headphones that only support Bluetooth 4.2, the connection operates at the older 4.2 level. All advancements across hardware generations become irrelevant. Because the Bluetooth version is determined by the physical radio chipset, you generally cannot update an older device’s version.
A Pandora’s Box of Other Malevolent Gremlins
There are also profile versions to consider. Profiles tell devices what kind of data they will exchange and make adjustments accordingly. The idea is that connections between different device types will be optimized. However, there is a dizzying array of profiles, many have not been updated in years, and many devices do not support the best and latest profiles. This explains why audio quality on earbuds can be excellent for music but terrible for phone calls. Profiles are often encoded at the hardware level, so if your older earbuds do not support a new headset profile, call quality will never improve.
What can you do to fix Bluetooth issues? While versions and profiles are often locked to hardware, you can sometimes see improvements by updating device software, firmware, or drivers. Pairing devices from the same provider (e.g., Apple) can help because they use proprietary Bluetooth tech to ensure reliable pairing. Checking your device’s Bluetooth hardware version and supported profiles can also keep you ahead of the curve, though wading through dozens of profiles is not something most users want to do.
