Tevo Tarantula I3 filament clogging up
Getting that first layer to stick is sometimes pretty hard, you just need to find a good combination of settings. Clearly your filament does not stick too well as the brim comes off after been laid down after a while.

Parameters that affect adhesion are:


Bed temperature; a temperature close to the glass temperature is favorable as the filament is soft at that temperature, the stresses are low due to this softness and the smaller temperature difference. You already tried to increase bed temperature: 50 - 60 &deg;C should be fine for PLA, there is no need to go higher than 60 &deg;C,
Hotend temperature; the temperature of the filament deposition could be increased for the initial layer, usually a 5 &deg;C increase over the standard temperature should be enough,
Overextrusion; a small over-extrusion on the first layer (filament flow scale factor larger than 100 %) could sometimes help to better adhere the first layer, but usually this means that the nozzle to bed distance is too large,
Correct leveling and correct nozzle to bed distance; level the bed as good as possible or scan the bed and use mesh leveling if the build platform does not have a uniform (flat) shape, also make sure the distance between the nozzle is correct: too small or too big cause the filament not to stick very well.
Debris in nozzle; debris in nozzle can cause non-uniform extrusion, cleaning the nozzle with the atomic method (heating up the nozzle, inserting filament, cooling down the nozzle and finally yanking out the filament cleaning all the cooked stuff inside),
Cleanness of the bed; make sure the bed is not greasy,
Tack of the bed; the use of a PVA based substance on the bed like e.g. gluestick, hairspray or specific printer sprays like 3DLAC increase the bed adhesion considerably,
Bed preparation; sanding the bed to roughen the platform, using tape, etc. are all tricks to get the filament to stick better.


Either one of the suggested parameters or a selection of these are the answer to your question, just figure out what works best for your printer.