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The flashing low battery symbol is the way Canon film cameras showed that the camera has had an error and has stopped functioning. It can have multiple causes - but for a quick check remove the lens, turn off the camera and then turn it back on - see if the symbol stops flashing. A problem with the lens can also cause this problem (usually a failure of the aperture unit)
If it's fuzzy and grey then all you need to do is replace the batteries.
If it's completely dark then remove the lens and look into the lens mounting. If the mirror is stuck in either the fully up or partially up position, then the most likely cause is also a flat battery.
If the mirror is fully down and you still have a completely dark viewfinder then you have either left the lens cap on or you have a dislodged pentaprism (usually the result of a dropped camera). The second problem will put the camera totally beyond any economic repair unless you open it up and try to resecure the pentaprism yourself; it's not really a DIY job and if you find that there are broken parts inside then the camera is destined for the trash can, but you'll have nothing to lose by trying.
There are only a few things that can cause this problem.
1. the mirror is not seating all the way down.
2. the pressure plate on the back door is loose.
3. the diopter on the finder is not adjusted to your eye.
4. long exposures ( vibration ).
Check your lenses with a different camera body.
Check your negatives with a magnifier. it could be printer problems.
Assuming the film door opens from the right, then the most likely reason is the light seal on the door. If it's just got dirty, brush it clean with a stiff brush. If it's badly worn then a camera repair shop may replace it for a reasonable fee - although I have done DIY repairs on this sort of thing using velvet :). Not for the faint-hearted tho'.
BTW the reason it's random is probably that it depends on how long each shot was in the gate before winding on and the ambient light conditions.
Most manual cameras have a button to release the film on the bottom of the camera, push the button in and turn the rewind crank (left side of the top of the camera) until you feel the crank suddenly turning much easier.