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That gurgling sound is the sink drain being briefly starved of air because the toilet flush creates a pressure drop in the shared drain stack. In most cases the fix is straightforward: the air admittance valve (AAV) connected to your branch drain line has either clogged or failed and needs to be replaced. It is a minor repair, but leaving it unattended can occasionally progress to slow drains or sewer gas smells, so it is worth addressing soon.

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Good news: deleting from an exFAT drive does not immediately overwrite the file data, so recovery is very possible if you stop writing new files to the drive right now. Tools like Recuva (free) or PhotoRec can scan the raw sectors and reconstruct the folder in most cases. Run a deep scan, point it at the drive letter, and filter for PDF and spreadsheet file types to find your returns quickly.

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A fan that spins but a compressor that stays silent usually points to one of three things: a tripped high-pressure or low-pressure safety switch, a failed start capacitor on the compressor motor, or a refrigerant level that has dropped low enough to trigger the low-pressure cutout. The safest first step is to locate the disconnect box next to the outdoor unit and check whether the capacitor shows any bulging or leaking, since that is the most common and least expensive cause. If the capacitor looks normal, the system likely needs a refrigerant check by a certified HVAC technician.