Items 1, 2, 3 could be electrical issues. Check the alternator belt for tension and condition, and replace with an authentic Subaru part if necessary. Check the battery leads and the condition of the battery also.
4 could be
a. Any or all of the hoses leading to that reservoir.
b. The reservoir itself, as it is two pieces with a seam and the seam could leak
c. The radiator cap on the reservoir.