As one member of the party Deathstern mentioned (I play an Oath of Vengeance Paladin) I feel the need to explain the situation in more detail.
1. The player who plays the wizard is absent for like 3-4 months, so I have to play both characters which lead to concentrating on my paladin and to not being perfectly firm in the exact amounts of spells and their usage of the wizard. This is due to the fact that I have only an old character sheet for the wizard, and as we all know, playing a wizard is complex enough if its your own character.
2. Yes, there is a pattern in which the gunslinger dies. Except for one overwhelming fight, he does not act tactical enough.
The last death, and that is why he posted here, happened as we had a random encounter against a single plant monster. Instead of leaving the fight to both the paladin and the bloodrager and withdraw tactictally by using 5-foot-steps over 2-3 rounds in combination with full defense, Deathstern decided to unneccessarily engage in the fight. Until then the bloodrager had taken 0 damage (having 200 HP) and the Paladin 10 damage (having 157 hp and still 18 Lay on hands with 14d6+28 healing).
Because the bloodrager envoked an aura of fire, and because the plant grabbed the gunslinger and pulled him on the bloodrager, he took two times fire damage and died from that.
3. Yes, he asked for a buff from the wizard which I denied for the following reasons:
A) We had a previous encounter where he and the wizard also died because the GM tried to kill us. As this was an encounter in a dream world and does not lead to real dying, only to insanity, fair enough. The fight the GM unleashed upon us included having nearly all the encounters of the whole dungeon coming in 4-5 waves upon us. At the end of the fight the wizard had zero spells left and the paladin had 0 Smite Evil and 2 LoHs left. Only then were we allowed to being out of combat and rest.
B) In the campaign we are acting against a time counter. We are short of the final engagement and as we have only 2-3 days left I did not want the wizard to waste one of his spells against a single random encounter.
C) The pattern of dying is one that is due to tactical errors mostly, imho at least, and due to the low CON and HP of the gunslinger. Deathstern is concentrating on a build full of special abilities (flying gunslinger with stealth) and what not but has neglected the basics, like for example taking Toughness or whatever as a feat to improve his chance on surviving if he becomes engaged in a fight.
It is not that we do not buff. It is not that the whole party is not overpowered (we won the fight which should have even killed a 1-2 level higher party) due to the wizard crafting like crazy all the time.
Its just that I decided to save spells because we are very near to the final boss, the random encounter looked really harmless to me and the bloodrager, and that I did not know that the gunslinger would attack with his really low damage against a tree and therefore would die.