Anyone else had issues with JK BMS dropping Bluetooth connection mid-charge?

Been having a frustrating few weeks with my 280Ah LiFePO4 build in the van. I've got a JK BMS (the 200A active balancer version) paired with a Victron SmartSolar 100/30, and the Bluetooth on the JK keeps dropping out after about 10-15 minutes of being connected in the app. Doesn't matter if I'm standing right next to the battery box — just cuts out and I have to close the app and reconnect. Bit annoying when you're trying to watch the cell voltages during an absorption cycle.

I'm running Android 13 on a Samsung A53 if that's relevant. I've tried two different phones and the same thing happens on both, so I don't think it's a handset issue. The BMS itself seems to be working fine — balancing kicks in around 3.45V per cell, charge and discharge are all behaving normally, SOC reads sensibly. It's purely the app connection that's flaky.

Has anyone found a fix for this, or is it just a known quirk of the JK app? I've seen a few mentions of a newer firmware version (v11 something?) potentially helping with Bluetooth stability — has anyone actually flashed that and noticed a difference? Keen to hear if there's a setting I'm missing or if this is just something I have to live with.

@Trevor1979 mine does the same on the boat — I've just accepted the JK Bluetooth has the attention span of a golden retriever near a squirrel.

@Trevor1979 had the exact same issue with my 200Ah build last summer. What sorted it for me was turning off the "sleep mode" in the JK app settings — it's burying itself in a low-power state when it thinks nothing's happening. Also worth checking which version of the app you're running, the older versions were genuinely dreadful for maintaining connection.

One other thing — keep your phone screen on whilst monitoring during charge cycles, sounds daft but the Android Bluetooth stack drops BMS connections aggressively when the display sleeps on certain phones.

The BMS itself is cracking value for money, the Bluetooth implementation is just a bit rough around the edges. If stable monitoring really matters to you long-term, a cheap RS485 to USB adaptor wired directly gives you rock solid data via a laptop. Sorted mine completely.