Maybe yes. And just to add to that, I check the screws on my RDAs regularly as they so work themselves lose sometimes. I don't know why. Maybe gremlins
As the coil heats up, the metal wire expands and then contracts again as it cools. The continuous expanding and contracting of the wire can do one of 2 things to cause the screws to be loose. (1) The most probable is that as the wire expands, it minutely backs the screw out by applying pressure between the base and the bottom of the screw head. Thus, causing the screw head to be lifted and the threads to back out to compensate for the pressure. Or (2) the less probable is that due to degradation of the wire due to heating, it loses minute amounts of material and loses mass. The loss of mass is noticed as a thinning of the diameter of the wire; causing a gap between the contact of the bottom of the screw head and the wire.
No matter which of these is occurring, the instance of loose screws in an electrical circuit is a common phenomenon and is well documented; even if the original work was done well. The following is from the ECRI Institute, though there is not solder in the connection, the same principal applies:
Terminal Screw Loosening
The most frequently reported problem is the loosening of terminal screws in plugs, resulting in loss of power and/or loss of ground continuity or overheating of the plug. This problem can usually be traced to tinned wires or to inadequate tightening. Tightening a terminal screw on a tinned wire exerts forces that cause "cold flow" of the solder. The wire-solder combinations relax and change shape, and the terminal screws loosen. This type of cold flow may also occur where solid, rather than stranded wire is used. Inspect incoming equipment for tinned leads on power plugs. If you find any, cut off the tinned portions and rewire the plug. Advise the manufacturer and ECRI so that we can help eliminate the practice of tinning wires.
Inadequate tightening occurs because some maintenance personnel do not know how tight the screws should be. Some manufacturers have recommendations on their installation instructions; we think that 10-14 inch-pounds of torque is adequate. We do not suggest using a torque screwdriver for each installation, but each installer should practice with one to get the "feel" of the required tightening torque.
Loose terminal screws may sometimes be detected by the "rattle test" (shaking the plug and listening for rattles indicative of loose screws). However, this test may not detect screws that are only slightly loose, and plugs should be inspected annually (coordinated with inspection of the equipment). We do not advocate routine disassembly, but disassembly may be necessary if the rattle test or ground continuity checks indicate problems.
