Home: Single wide trailer in upstate NY.
History: Aug/Sept started seeing sediment in kitchen sink aerator. Cold water flow to all faucets decreased, but still good. Nov pipes ended up blocked. Plumber came out to clear, showed landlord how to clear in the future, as ground was already freezing and underground work wouldn't be possible until the spring. December pipes froze (luckily a thaw came 1-2 days later, which opened pipes up again). Early Jan heat tape and new insulation was put on exposed pipes under the trailer.
Current: A week ago, cold water all but disappeared. Still have hot water at full pressure. Occasional cold water drip from kitchen, thin stream from bathroom sink, nothing from bathtub.
Odd part: When hot water is turned on in the bathroom sink, it also comes out of the kitchen sink, even though the hot water is not turned on in the kitchen.
Everything I've read has indicated that frozen pipes would disrupt cold AND hot water, but our water problem is only affecting the cold water.
So... based on this info, would you think the pipes are frozen or blocked?

