Same issues with my FP4 (FP4.QREL.15.14.3). An app switch kills immediately the previous app. 2fa apps are mostly not usable anymore. Pictures with 0 bytes und audio apps are randomly killed after a few minutes. The issue is there for months, but no real communication from the fairphone company. Android 13 was also smoother than android 15. The FP4 hardware is ok in 2026, but the software keep going worse.