RX2 6m Sensitivity Loss — Was Working Previously

[W4NNG]

Radio: Anan 7000DLE MkII
Software: Thetis 2.10.3.11
Problem: RX2 has significantly reduced sensitivity on 6 meters only. HF works correctly on both receivers.
Test Results:
Same antenna, same beacon signal: (Move 6m antenna from RX1 to RX2
• RX1: 6 µV
• RX2: <1 µV
(Approximately 15-16 dB difference)
What I've Verified:
• HF performance identical on RX1 and RX2
• DDC/ADC assignments checked — reset to default, no change
• 6m LNA enabled for RX (Disable unchecked)
• No per-band RX2 antenna settings
Also tried it with a new default DB

History:
RX2 6m sensitivity was previously equal to RX1. Problem appeared without known hardware changes.
Question:
Is there a Thetis configuration setting that could cause RX2-only sensitivity loss on 6m while HF remains unaffected? Trying to rule out config issues before investigating hardware.